Yes I agree, you have many fewer cartridge options with B&O tables. But the B&O cartridges and the Soundsmith replacements are of very high quality, argubly at least as good as anything in the same price class. They're also a good value for the money, and will last a very long time if cared for.
So if playing around with the turntable itself, and trying out different cartridges, etc. is important to you, then maybe something else . . . a Music Hall MMF-5 is a great recommendation, and a nice-sounding turntable. But I've personally compared the MMF-5, MMF-7, and a B&O Beogram 7000/MMC2, and the B&O walks all over the Music Halls . . . and it's automatic, to boot.
So if playing around with the turntable itself, and trying out different cartridges, etc. is important to you, then maybe something else . . . a Music Hall MMF-5 is a great recommendation, and a nice-sounding turntable. But I've personally compared the MMF-5, MMF-7, and a B&O Beogram 7000/MMC2, and the B&O walks all over the Music Halls . . . and it's automatic, to boot.