I have run both. Both are great choice.
My feelings :
more recoil with m2 than 1301
easier to load faster with m2 than 1301
more tuning parts available for m2
M2 fits better for tall people (1.80m and taller)
if you don’t like clean your gun : m2 is your gun
1301 is ipsc world champion, m2 is #2, #3, #4 and #5 for 1301 again.