I love Legends so much that it would be easier for me to list to the very few I don't like instead of all the ones I like...
I don't like:
-Cybertron Vector Prime (visible face is a turnoff)
-Cybertron Scourge (arms are too weird)
And even then, Vector Prime has a cool robot mode and Scourge has a cool dragon mode. So...
My favorite has to be Devastator though. Hard to beat.