Ortofon 309 vs. SME 3012 for SPUs

It seems that both arms work very well but I am definitely interested in having the arm for exclusive use with SPUs (I already have an outstanding TW 10.5 arm for modern cartridges).

Does anyone know what the differences between the RMG 309 and the RMG 309i version are? I heard an RMG 309i paired with the SPU AE90 on another system using my same turntable and thought it was an outstanding combination. How does the older RMG 309 compare sonically?

I did not mean SPU lacks resolution, I meant the SME is not a highly resolving tonearm. I have compared it to a Naim ARO and 47 Labs RS-A1 and both of them showed how much details the SME was lacking.

I decided to buy a restored Ortofon RMG 309 arm and am now on the lookout for a good SPU :) I have heard both the AE85 and AE90 (I liked the AE90 most) but those command pretty high prices on the big auction site and I have read that the Silver Meister is one of the best of the bunch. There are other SPUs that I would ultimately like to try but most others would require a SUT (my preamp has 68db of gain).

I also have heard/read that SPU Silver Meister (earlier one, not MKii) is one of the best matches with Ortofon RMG 309.
To enjoy the old SPU sound, SPU Classic GM E MKii may be good enough. Most other SPUs cost twice as much, and I wonder whether they are that much good for old 50~60's music.

Ortofon will say their current ST-80 SE ($1600) would be a best match, and Verto ($1000) would be good too.
SUTs based on Hashimoto transformers may worth a look. Or Bob's device?