Well no theif class has an advantage in the stealth factors (correct me if i'm wrong) but it depends on how u play the game.
Assassins are cool for the backstab posion damage but only get 15% to distribute between theif skills.
Bounty Hunters are great for laying traps then leading the enemy into them! Though some people preffer the normal theifs traps to the special one but its all the same in the end!
Swashbucklers are more about fighting but can still stealth (but CANNOT!!! backstab)
As to stats: Dex is a must! 17+ at least, since dex increases theif skills.
Strength is useful for lugging things around and backstab but it dosent have to be that high. 15-16 is fine but if youre a human and u want to dual 17 is needed. Hope that helps.
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