#3
depends. in my opinion, flanger's for rhythm people, and phaser's for lead people.

but phaser's use in funk rhythms, so im really screwed. So get the phaser, i think its more practical.. err yeah
#5
I'm more of a flange person myself lol! I just was interested to know what other people think. I know what you mean about the lead thing. A flange sounds more natural so it lends itself to rhythmic stuff whereas a phaser is a sort of otherworldly sound that would go nice on solo's.