Hehe, bass is better! But that's just me.
I played guitar originally, hated it, got to play bass and love it... bass is harder with moving about, because since the neck's longer the frets are further apart so your fingers need to streetch more... But I couldn't do bar chords on guitar.. they're hard >.< Bass sounds good because it adds depth to the music... A lot of older rock was driven mainly by bass (and Garbage's first album... Niiice)
I think of a band like a body:
Drums - Bones (holds everything together)
Bass - Muscle (gives it strength, depth)
Guitar - Skin (on the outside, a pretty obvious thing... works with prejudice cause some people judge music just cause of the guitar instead of looking deeper - a bit like racism)
Vocals - Face (kind of like the racism concept, and a focal point)
Keyboard and any extra stuff - Makeup, hair style, piercings and tattoos! (accesories to make it more interesting or "wacky")