Looking for cartridge recommendations

I have a Yamaha P450 turntable that I've had since I bought it new in the 80s. I'm running it through a Pioneer SX-850 and can't seem to find any information about the built-in phono stages.

The turntable currently has a Grado FC+ cartridge on it and I would like to upgrade, but have no idea what I should be looking for. For example should I be looking for a magnetic moving or coil cartridge?

I've been looking at the Ortofon Blue, and similar positioned cartridges in the Sumiko and Nagaoka lines.

I would really appreciate any help.

Thanks.