I bought a new cartridge for my old Thorens rather than buying a new TT, so I struggled with this question. I don't know the B&O, but I'd say go for the cartridge. If it doesn't work out, you still have the cartridge to put in a new TT. Good luck
A B&O cartridge would not be a very good match with modern medium mass tonearms. It is VERY low mass and requires a low mass arm, not very common nowadays. So buying a cartridge( if they still make them) with the idea of passing it to another 'table if need be may not make so much sense.
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