I watch and enjoy both. Back when Robotech was originally on I had given up on anime, I had seen Star Blazers and loved it, but I also thought it was just a fluke... When a friend recommended Robotech - saying it was as good as SB I gave it a try, even though I was not expecting much... Even with the rough edges I saw that it was something different, a mix of action and character growth - which we have to remember was pretty much unheard of on prime time televison at the time (looking back I can't think of any examples at all till Babylon 5)
From there I looked for and found an Anime group, and saw the original Yamato movies (Farewell got me hooked on that franchise all over again), Vampire Hunter D, and others. So I give RT it's due, it was what opened the floodgates (and videotape) to Anime in the US.
Generally I'll take Macross over RT, but Macross 7 is right out - I'd rather watch the original RT over that any day, so each franchise has it's clunkers. The RT books on the other hand are excellent (although End of the Circle gets too wierd for my taste).
I better quit rambling before I really go off kilter...