In a sg game, what is more powerful:
an enchanted stone sword
OR
a plain iron sword
also If you have any other knowledge on enchanted things vs plain things. Please tell.
Added (1). Also, is enchanted leather boots and helmet more powerful than chain?
Depends what enchantment is on the stone sword. If it is sharpness I or greater it is more powerful or if it has flame aspect 2 it is more powerful. The other enchantments have no affect on damage versus players. Hope this helped!
Okay, to answer your sword question, it all really depends on the enchantment, because you could be asking "Which is more powerful? A stone sword with Sharpness IV (I'm exaggerating a bit here, its near impossible to get a sword with Sharpness IV in Survival Games) or a plain iron sword?" If you are running on the latest Minecraft, you should be able to hover over the item in your inventory and there should be blue text that says "Random Number Attack Damage", that will determine how powerful your sword is, even if its enchanted.
Now, moving on to your leather boots and helmet question. You need to be a bit more specific, because I don't know if you are asking a "Enchanted Leather Boots & Helmet Vs. Full Set of Chain Armor" type question or a "Enchanted Leather Boots & Helmet Vs. Chain Boots & Helmet" question.