I am a Indian classical violinist. I want to record my violin along with a software instrument from the iPod at home. So I need a 2x2 usb audio interface. I will be recording the violin by a Cherub WCP-60V pick up. I am confused between the two I mentioned in the question. From the reviews I read, the preamp of m-track is not so good, while that of the scarlett 2i2 is very good. But the m-track has an option for switching the monitor output between mono and stereo, which is of a particular use for me, as I only need the software instrument (Tanpura and tabla) sound from the monitor and not the violin itself (I will be recording in my room, and the monitor is essentially a Sony 2.1 speaker). This option is not provided in the scarlett 2i2. (It is provided in the 2i4, but it is too costly for me) How significant is the difference between the pre-amp quality of the two? If not much, I will go with m-track, else scarlett. Thank you in advance!
What software are you planning to record into? You should be able to monitor through the software and disable record-monitoring on the violin track.
I can't speak for the quality of the M-Track's preamps, but you can get the functionality you've described through your computer, so you should go for whichever you think sounds best.