Best MM?

It's lovely. Without comparing, I'd agree it has drive life and holography but the Delos may have more timbre in voices and acoustic instruments but that's just my memory. I'll know more this weekend. There's nothing more I'd like to do than get out of the high priced mc world!

I will say, I do think I've found the bass I've been missing!

What arm do you use with your 2M?

SME Model 10A turntable. It comes stock with an SME 309 variation tonearm.

All of the best mastering engineers from the golden era of music (60s-80s) preferred MM to MC. 

I’ve also personally compared MC and MM to many real actual master tapes. MC is severely EQed and distorted. MM is practically indistinguishable from tape.

Any of the Soundsmiths in that price range. Very neutral, dynamic SQ. I've had carts from Shure, Sumiko, Clearaudio, Dynavector, Ortofon and a few others in that price range and found the Soundsmith's worked and sounded the best in my system.