Starter motor for YS170

I have recently purchased a YS170 engine and need to upgrade the starter motor. This is my first YS engine. Any Ideas?

I have looked at Sullivan starters 12 or 24 volt.

Kavan starter with planetary gears model no KF111.

Magnum geared starter 12 volts.

GS Models geared starter 8016 12 volt or GS8018 24 volt from Al's Hobbies (UK).

Which would be most suited geared motor or non geared high torque?

Thanks for any support.