Question

I would like to be able to switch the standalone compressor between the different compressor types like in Logic. (FET, Opti, Tube, VCA)

Answer 1

Studio One's "Compressor" plugin is a neutral/transparent compressor plugin and is not modeled after any hardware FET, Opto, Tube etc. compressor units.

You can find these types of hardware emulation compressors in the Fat Channel Plugin, where you can select the type of compressor (FET, Opto, Tube etc.) and switch between them.