I hand to hand combat, Bowser. If you include Eggman's creations(giant flying fortresses, his hovercraft of 1000 weapons, metal sonic, giant final boss robot thing), still Bowser. All of his creations were destroyed by being body slammed constantly by a hyperactive hedgehog with a strange fascination for jewelry.
Firstly, Modus Operandi:
Bowser and Eggman both gather armies to do their bidding. Whilst Bowser seems to be satisfied with cartoon amphibians dancing to the background music Eggman turns cute little critters into evil robots. More badass, more useful.
Point goes to Eggman
....Really, Bowser? Cake? You kidnap the princess to bake you a cake? Unless that's a cover up phrase for kinky stuff that's not much of a big motivation there. Eggman is a little more modest since all he wants is TOTAL CONTROL OVER MOEBIUS!
Point goes to Eggman
Next up, Face to Face:
Any more explanation needed? Look at them. Eggman is... a noodle-extremity fat blob who runs away as soon as his latest devious invention has been destroyed. Bowser is a big, spiked reptile, occasionally spitting fire, which will probably pummel you to the ground for looking at him wrong. Unless Eggman works like the Blob, he won't stand a chance in a face-off.
Point goes to Bowser.
Let's continue with Dragons (TvT: second in commands):
It's hard to pinpoint direct second in commands for both of them. Closest thing that comes up would be Knuckles for Eggman. I haven't read the original manual in a while so I can't tell what motivated him to work for Eggman, but he appears to be rather proficient in being somewhere first and making your day a living hell. More likely it's Mecha-Sonic, who is not only an evil cyborg but also psychological warfare (fighting against yourself) ...Bowser seems to run a family business including Koopa Jr. (which raises the interesting question: conceived by WHO?) and the Koopa kids. Honorable mention goes to Kamek as court mage.
Point goes to Eggman
Next on the list is Efforts:
Given, Bowsers forces are widespread and commandeering them must be a chore, but they mostly run around the lands they have conquered, spare for the occasional castle (which then in turn are rather big, props). However, sure, in the Galaxy games this might be considered a bigger thing, but seriously... Galaxy series? Eggman however, on his conquest for Moebius, covered entire LANDS with factories and machinery as part of his evil cute-critter-to-robot-critter army agenda. Also: DEATH EGG! A giant space ship.
Point goes to Eggman
Bonus points for Bowser's R34ability. >:3
So we're at the end of our little comparison and the undeniable winner is:
Yes, even though Bowser would probably teach Eggman new horizons of pain in a direct face to face fight, Eggman just has the better means of warfare in a full-scale conflict. And yes, I'd LOVE to have this as an actual game!
I'm the nostalgia cr... no wait!
Rollback Post to RevisionRollBack
And like the baseless fabric of this vision, the cloud-capped towers, the gorgeous palaces, the solemn temples, the giant Screen itself, all of which we inherit shall dissolve. And, like an insubstantial pageant faded, leave not a byte behind.
Now I've been a rabid Mario fan for most of my years of gaming, aside from Final Fantasy and such, and I've grown tired of both Sonic, and his sharp nailed, skin clawing, hair pulling fangirls.
But Eggman is epic. Him and Bowser should really just team up, and take turns slapping Mario and Sonic around.
This needs to be the plot of the next Smash Bros. game.
Dr. Ivo Robadass builds a dimensional teleport, recruits various villains and their minions, and then proceeds to take over all of existence. With full voice acting.
[Note]: The thread has been re-awoken not too long ago, but I only noticed this after I typed up this 4-paragraph text, so...
It's really tough to say, in my opinion. If we're talking about 1v1 with no interference using minions, machines, etc, I think that Bowser trumps over Eggman easily due to strength, endurance and physical traits (fire, spikes, etc). However, Eggman is canonically faster than Sonic (well, the earlier games were one of the only times that we've seen Eggman physically run), so Bowser may have a hard time catching him. However, if Eggman and Bowser can use their machines and minions, we'll have to use some serious comparisons.
Even with Eggman's mechanical vehicles and mechs, he's still pretty weak. Some of his machines can easily be destroyed just by a few hits from a Hedgehog. Not only that, but he constantly leaves himself open to attack. However, he has many practical weapons that could be incredibly useful depending on the situation. For example, he has lasers that can scorch entire planes of land, as well as modules that can manipulate gravity, and a plethora of other weapons. Eggman's army, however, is also rather weak; as many of them can easily be destroyed just by a few jumps.
Bowser's army, unlike Eggman's, isn't robotic. However, this hardly makes a difference in endurance, as they can also die by just a few attacks. Not only that, but some of them can be used against each other (ie: Koopa Shells). Bowser himself, though, is much more competent. Being able to survive being crushed by an entire castle countless times makes him a walking tank. Not only that, but he's strong enough to destroy boulders and has the firepower to incinerate forests. And when supplied with a magic reserve, his power is increased tenfold due to his ability to grow to massive size (a common cliche in current Mario games). However, he's incredibly slow due to his cumbersome weight, a strict contrast to Eggman's supersonic speed. Not only that, but he has poor judgement when compared to Eggman's IQ of over 300. Also, certain tactical weapons of Eggman seem capable of rendering Bowser vulnerable.
Overall, it's a difficult decision. Due to Bowser's physical capabilities, he seems slightly more capable of victory over Eggman, especially if it was the 1v1 battle previously mentioned. I'm not too familiar with recent Mario/Sonic games, as I haven't played either series in a while, however, so my ideas of who would win can be easily taken with a grain of salt.