OK, OK, from the two choices you mentioned....
...depends on what you plan to do with this quad.
If you are gonna ride primarily woods, rough terrain, hilly areas where you'll need down low grunt power to pull the quad out of tight spots, get the raptor. Its a four stroke, and has a more forgiving power band,
If you'll ride primarily dunes, open fire trails, and teeth grittin', hair on fire high speed terrain, you can't beat the Banshee. Its power band is a sort of on / off power. When its off, you ain't goin' ANYWHERE. WHen its on, yer goin' places you may not wanna go. You NEED open, more forgiving spaces for this quad. Trust me, other than these types of open areas, you DO NOT want a Banshee. But for open areas, this IS the ticket.
Of all the GNCC pros who race, maybe one or two ride banshees. (GNCC = Grand National Cross Country) Almost all the rest of 'em got variations of teh Fourtrax 250R. [:D]
Seriously, if you are handy in the garage, DO NOT over look a used 250R that you can restore.