If you only need one channel, the Apogee Jam and One are both great. The Duet is more versatile, for sure. I've got the Jam and it's a really nice sounding little interface, perfect for quick ideas and demos on the road or quiet practice. I think it really depends on your budget and what all you want to do with it. I hear pretty good things about the Focusrite stuff, too, so that may be worth a look.