Best Tonearm for Thorens TD-124.

Have a Td124 mark 2 with an Ortofon AS212 tonearm.
i found at at a garage sale a Thorens TDK101..seems to have been a kit one would put together、this one never was assembled and there is the original tonearm that seems to fit perfectly on the 124 .should it go on instead of the newer ortofon?

That’s a great tonearm for sure.. But it’s kinda either the AS212 or the original unused tonearm that came in the Tdk101 kit..don’t even know if it’s compatible but seems as such..which ones better?