In the late 90's to early 00's I did own a Thorens TD160B mk2 and used an Incognito rewired Rega RB300 tonearm which was good and then a Hadcock 242se which I preferred.
I then bought a NA Hyperspace which came with an early NA Mentor tonearm, this was the alloy tubed model, not the later or current carbon fibre tubed model.
On the Hyperspace the RB300 was OK, I then tried Roksan Tabriz Zi which I slightly preferred and would have said on a par with the NA Mentor tonearm. Having sold the Thorens I then mounted the Hadcock 242se which I preferred to any of the others, I then tried a SME iv which was most disappointing, I was expecting a massive upgrade in SQ but it just didn't deliver despite the beautiful build quality and finish, positive reviews and expense. I then bought the newly released SME M2-10 which was the first tonearm which equalled the Hadcock 242se in sound quality and very much bettered it where build quality and finish are concerned.
During this period of time I was in my mid to late 20's through to early 30's (good hearing). I tried the various tonearms with a Roksan Chorus Black (Goldring 1042) Dynavector 23D, Wilson Benesch Ply which is a (LOMC) Benz Glider mounted on Carbon Fibre platform , Shure V15v-mxr and a Lyra Argo MC
This was all done as I was very interested in different tonearm designs and finding out what was 'best' for me rather than being told by a dealer or magazine review.
I also used a Rega Planar, STD 305M, Gyrodec (AC) , Voyd Ref and Helius Cyalene tonearm and a Gyro SE (DC) with the Technoarm (first version). These turntables more or less covered the different belt drive designs available at the time with different mass, suspension and motor drives.
I would guess that both the Rega and NA will work just fine on the Thorens with a suitable cartridge (they're a decent deck IMHO) which you prefer will be down to personal preference.
I hope that helps a little.
