I guess it depends in what type of music you playing. As for me, I love to play around with the leads and try different default effects (flanger+delay, etc) they have.

When it comes to live performance, the resonance and cutoff knob come in handy!

I think GW-7 has a nice default tones such as pianos and strings. The rotary organ is my favorite. Breathy sax sounds real it scares me.