I actually own both of these mixers, and I like them both a lot.
The Yamaha has a more straight-forward, conventional interface. It has really good effects and e.q. and is exceptionally clean, as you would expect from Yamaha.
The Roland has the room equalizer thing which Fran likes so much, but I haven't seen a need for it. I tried it once but didn't like the results, so I probably wasn't doing it right.
It also has great effects and e.q. The interface is more menu-driven. Knobs have various functions depending on what menu you're on. The display shows input levels, output levels, e.q., pan, and effects settings, depending, again, upon which menu is open.
It has a smaller footprint than the Yamaha and easily fits in just about any setup you could imagine.
There is compression available. You can set up various scenes and save them. A lot of this is overkill for my needs right now, but I have it in the system because of its size.
I basically run everything pretty flat as far as e.q. The Bose doesn't need much e.q.
As I said, effects are good on both of them. If I had to keep one only, I'd probably keep the Yamaha.
I have a Peavey that I like better than both of them, but it is a little larger.
You can't go wrong with either one.
Drive on over and check 'em out if you like.
DonM