I have ran the 212 & the SOCOM Mini together... The Mini on a 14.5" barrel is still pretty loud, but the Mini on my 18" barrel is much more pleasant. Unless you need the shorter OAL, go with the full sized can (assuming 16" & less).
If OAL is the main goal then go with the Mini. The mini doesn't give up a whole lot to the 212 length wise, but the 212 is noticeably quieter then the mini on most guns I've heard them on.