What's the difference between tools from the Crimson and the Corruption?

Well, each armor posses different effects based off of whether it's corruption or Crimson. The Crimson posses more stronger enemies and different weapons to acquire. The armor effects for the Crimson armor (sry forgot name) are, %6 increased dmg and a greatly increased health regen which, as I think and understand it, it helps with battling those enemies and help regenerate life after battles. In the corruption there are few enemies which have a slightly high health and less dmg but they mostly back off or travel such as eater of souls and Devourers. A great thing to have help are the movement speed effects since they move around a lot. Having these effects make it easier to travel up to them when they move away and the melee speed can help put more hits in, especially with their low health. So, in my honest opinion Crimson armor is better since with corruption monsters having lower hp the hits u do get will be increased in dmg to help defeat them and when they spam hits or such like the Devourers the health regen is useful but the shadow armor in Crimson wouldn't make a great performance since its most likely to keep more hits in on the Crimson monsters and be able to escape them in bad situations which is sort of wise for the face monsters and most Crimson enemies have high movement so they'll keep up and in most situations their high dmg could kill u quick with no time to escape plus the more hits might not help on their high hp though it is possible to score lots of hits on them but knockback won't do the trick since well as mentioned several times, they have a high movement speed to outrun the knockback. So over all Crimson armor can overrun and take over the shadow armor. In a battle shadow armor will score lots of hits but the regen will help and for the extra dmg or Crimson armor it will do a higher dmg but the shadow armor could outrun it but with no regen it will make no use (though normally u could escape enemies with shadow armor and fight and kill enemies with Crimson) so after chasing u could sneak hits onto the shadow armor and once and for all defeat or kill it so in conclusion despite the shadow armor so speed and hits per second the Crimson armor could kill it and do a higher dmg so even if u had a slow weapon without backing off u could regenerate quickly and do a high dmg so pretty much nimble forges make good equipment and things on weapons to help but primarily weapons like nights edge and terra blade have a fast speed so it would make no difference but higher on in the game u could argue shadow armor for weapons like nights edge and terra blade but by then you'd be on a different level of armor like cloryphite and hallow.So like said Crimson armor is better.