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Both are great turntables, it's going to come down to personal preference - Belt vs DD and how useful you find the pitch control etc.
I sold a pair of SL1210's about 12 years ago and kept my OG Rega Planar 2 . Don't miss the 121o's at all and the Planar 2 is still going strong after a belt and needle swap recently.
Miss the Garrard SP25 I also sold at the same time though, trying to justify to myself picking another one up.
Ok, sl1200 MK3 a decent deck compared to a rega planar?