If at all possible, I'd order a pair of M2 and a pair of M3 so I could test them both. Listen to 1 for a few days, then swap and listen to the other for a few days. Then send one of them back.

If not, most people would say to pick M2 with sub and M3 without sub.

https://docs.google.com/spreadsheet/ccc?...amp;usp=sharing