Nagaoka MP-150 vs MP-200

I recently upgraded my turntable which came with a Naga MP-150.  I like the 150, but can't help wondering how much difference a 200 stylus would make.  For anyone with experience with both, I welcome your thoughts. (Previously I had a Signet TK5e for many years, which I was happy with. Anyone happen to know what current cartridge would be closest sounding to that?)