ESB is a much better overall movie of the three. ANH will always hold a special place, and for shear entertainment, it’s a blast (saw it 26 times in the theatre as a kid). Return of the Jedi was fine, but it had a lot of last minute tweaks that just came across as ridiculous (like Luke and Leia being brother and sister; and if Vader was Leia’s father why didn’t he recognize her as such — thru the Force — when he was torturing the crap out of her in the first one...?)
So definitely:
ESB, ANH, ROTJ