I've just had longer to love Artoo. I also appreciate that he is a foul-mouthed but we don't know all the raunchy things he says. I hope he taught Beebee-Ate some hilarious vulgar curses.
Artoo has gone through so much and apparently fell into a state of severe droid depression. His new buddy helped him out of it. That's awesome.
So, 60% Artoo, 40% Beebee, 10000% love for both.