I don't know, DnD has years of development behind it, but to me 3,5 is still best. The first two were a bit odd in some parts, 4 was more like a system for an MMORPG game, I have no idea how the 5th looks like, but people agree that its better than 4th.
5e is pretty much a more streamlined version of 3e, because Pathfinder kicked 4e in the balls and stole it's fanbase.