Yup. The Dragon can be kept at bay with a bow, 2 stacks of arrows and a pumpkin. You literally need nothing else to beat it. In fact, it's been done before with just snow balls, a snow golem, and a shovel.
The wither requires more powerful equipment, and it's almost a necessity to have a regeneration potion.
Wither, because it has a ridiculous amount of attacks that do insane damage. When I fought it with fully-enchanted armor on every enchantment and a fully upgraded diamond sword and bow, it killed me within seconds.
I would have to say they both are equal challenging and give you a good fight. The ender dragon is more for a sense of that classical end game fight where the boss has stuff you need to kill before it will go down. (which makes him tough in all regards). The Wither however is more of the King kupa of Mario Hardest we are gonna see so far, because he eliminates your ability to know your health, is constantly in your face and not only that he is always blow stuff up and making your world look ugly!
-The Wither has 50% more health than the Enderdragon (150 hearts instead of 100)
-Inflicts Wither effect which damages you and heals itself
-Immune to arrows when its health reaches 75 hearts
-Pretty much impossible to create a barrier because it will destroy any block except obsidian to chase you down
-In addition to the Wither effect, it heals itself over time
-Sees you when you're invisible
-Unaffected by fire/lava
-Less health than the Wither (100 hearts instead of 150)
-Does not inflict Wither effect
-Easily killed with arrows
-Take out the crystals and you don't have to worry about it regenerating health
-Flies around and doesn't notice you half the time, giving you plenty of time to deal with the crystals
It is friggin impossibru to beat the enderdragon. He flies around like nobody's business. On the other hand, the wither is just a scumbag who just wants to annoy your [insert codec == cuss]. Shun the ender dragon. Wither can just stay at home
Honestly, i've fought the enderdragon on normal and he was a piece of cake with an Infinity & Power 4 bow. Non enchanted diamond armor; never got flung anywhere, never had to climb pillars...Just broke the crystals with my bow and whooped the dragon.
The wither on the other hand, sounds like a Bi ta ch (<- Not a cussword, sounds :D) and I wouldnt wanna fight him unless I REALLY wanted that nether star.
Wither easily. It actually has potential to kill you - and can get out of hand easily. The only possibility of getting killed while fighting the ender dragon is because of silly mistakes such as getting close to the edge of the island, looking at an enderman (Although you should bring a water bucket anyways so this isn't a problem) and etc.
Anyone who says the enderdragon is easier either has not played the snapshot, or is getting the two confused. The guy who said you could beat the wither with iron armor? Make a video and prove it. It's impossible (without 5 billion healing potions). The enderdragon, on the other hand, is a PIECE OF CAKE! He turns away when he's hit. If you time it right it is possible to literally kill him by punching him as he flies at you. He's far, far too easy for the final boss.
I actually defeated the wither in iron armour. Although, I did have a regeneration potion in affect and the armour was Protection 1 on each piece. I never got below half health. However, without potions I know it would be nearly impossible to kill in iron armour, and I really think the wither would be nearly impossible to kill without potions. (assuming you're not using protection 4 on a full suit of diamond armour)