If I enchanted a helmet with projectile protection IV, a blast protection IV chestplate, Protection IV leggings and fire protection IV boots. Would that be better or worse than a full protection IV set? I plan to use this one set for everything (ex. Mining, nether and end). Thank you for the help!
Full Protection IV is better in all cases; the specific forms of Protection are each twice as good as regular Protection (8 vs 4 EPF, with Feather Falling being 3 times better), meaning that you have the equivalent of 3 pieces of Protection IV against each specific type of damage - except for melee damage, which is only reduced by regular Protection, and fall damage, which requires Feather Falling IV and two pieces of Protection IV to get the maximum protection.
The only time I would not use full Protection is if you are playing on Hard since creeper explosions can kill you in one hit unless you have the maximum amount of protection against explosions; otherwise, other sources of damage are far weaker so you don't lose too much protection against them (e.g. creeper = 73 point-blank, about 36 at the "normal" distance, and zombie = 4). Fire Protection might be useful for the Nether but potions are far superior as they offer complete immunity to fire damage and general purpose Protection IV armor is good enough that healing from saturation can out-regenerate lava damage (even without regeneration you can last for about 29 seconds, which is plenty of time to use a potion) and the reduction in burn time from Fire Protection is less important these days since the faster health regeneration in 1.9+ can out-regenerate it; just be sure that you have a good food, like steak.
I myself wear a diamond chestplate and leggings each with Protection IV and diamond boots with Feather Falling IV, only wearing helmets dropped by mobs unless I'm working underwater, and don't have any issues with surviving (I'm a bit embarrassed to say when I last died), though I play in 1.6.4, without armor penetration, and Normal difficulty (I've tested 1.9+ a bit and by adding Blast Protection IV to my boots I offset the effect of penetration; likewise, in my modded worlds I add Protection IV to my boots to offset the general reduction in player armor protection).
Armor: Protection IV, Unbreaking III and Mending (plus additional enchants for specific items)
Helmet: Aqua Affinity and Respiration III
Boots: Depth Strider III and Feather Falling IV
Optional: Blast Protection IV on one piece of armor to better survive creeper surprise attacks.
Optional: Thorns III on one piece or armor to damage attackers.
Optional: Frost Walker II on boots (instead of Depth Strider)
Frost Walker will let you walk on water, or walk on Magma Blocks without damage.
Personally I find Depth Strider much more useful.
Pickaxe #1: Silk Touch, Efficiency V, Unbreaking III and Mending
Pickaxe #2: Fortune III, Efficiency V, Unbreaking III and Mending
Sword #1: Sharpness V, Sweeping Edge III, Looting III, Unbreaking III and Mending
Sword #2: Smite V, Sweeping Edge III, Looting III, Unbreaking III and Mending
I also like Knockback I (Knockback II is too much).
I personally do not like or recommend Fire Aspect on a sword.
Since swords are a close combat weapon you are likely to end up on fire yourself.
If you want to set mobs on fire, do it with a bow. And speaking of bows...
Bow: Power V, Unbreaking III, Punch I, Flame, Infinity and Mending (see note below)
Both of my current 1.12 worlds were created in an earlier version, so my bows have both Infinity & Mending.
For bows created in 1.12 you will have to choose one or the other (you can no longer have both enchants in 1.12).
Personally, I'd probably go with Mending, since arrows are easy to craft, and can be acquired in large quantities with a multi-mob or skele grinder. On the other hand, an AFK fishing farm will give you plenty of enchanted bows, so it will be easy to craft another OP bow if you go with Infinity and wear your old one out... ¯\_(ツ)_/¯
Axe: Sharpness V, Efficiency V, Unbreaking III and Mending
Optional: Fortune III or Silk Touch
Silk Touch is great for harvesting bookshelves and melons.
Shovel: Efficiency V, Unbreaking III and Mending
Optional: Fortune III or Silk Touch
Fortune will give you more flint from gravel (100% with F3). Silk touch will give you none.
Silk Touch for harvesting grass, mycelium, podzol, etc...
Elytra: Unbreaking III and Mending
These enchants are pretty much a must on Elytra (their default durability is quite poor).
Fishing Pole: Lure III, Luck of the Sea III, Unbreaking III and Mending
Some may suggest that having less luck or lure makes it better for certain things.
I have experimented with that and it is not true.
A maxed out pole is better, period! End of story. Just do it!
Optional: Shield with Unbreaking III and Mending
Shields are so inexpensive to make that the value of enchanting them is questionable.
That being said, mine is enchanted...
The order enchants are applied makes no difference in their effectiveness.
It may affect how many XP levels are required when applying the enchants...
Did I forget anything?
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