Adam Frisch is right the 690 is a much better option over a C90
I have already discovered passengers prefer the Aero Commander over other types. The tall cabin is a very big plus.
The only real problem is the spar inspections and the 241 AD. But if you do your homework you can buy a 690 that has had a spar renewal and just about all 690's have now had 241 done.
If the spar hadn't been done just make sure you get one that is on the max 36 month inspection programme.