Linn ITTOK LVII or SME M2-9 for LP12

I have a Linn LP12 / ITTOK LVII combo (AT mc cartridge).  I have read numerous positive reviews and comments regarding the SME M2-9 tonearm, and several comments suggesting the arm to be a good match for a LP12.

Based upon experience-  is the SME M2-9 better than the ITTOK, or would this be a lateral move ?

Net cost of the change would be about -0- so financial considerations are not an issue.

Ability to change cartridges would be nice, but this feature is not compelling enough for a lateral move.

Thank you,