Oh yeah, and Farscape's acting is definitely superior overall. You might find yourself scratching your head at the praise for its acting as you go through the first season, but eventually, that cast finds its footing so damn nicely. So in other words, wooden, cliched performances in the first few episodes ought not to deter you; they get so. Much. Better.
Babylon 5, on the other hand, has a few stellar performances surrounded by mediocre performances. I think a lot of that has to do with the directing, honestly; every now and then, the seemingly-subpar cast members manage to suddenly steal a scene.
Oh, and Babylon 5 has some horrendously poor guest actors, IMO. I don't mind "low budget" in most of the traditional senses of the term, but some of the one-shot villains are just absolutely laughable. Makes me sad.