If you want to experience the best hands down performance - go with OSR2:
https://discuss.eroscripts.com/t/osr2-sex-robot-for-sale-free-fleshlight-drying-rack-prices-negotiable/6250
Keons good just like launch but we’re trying to figure out better smoother playback algorithm at the moment
Handy is another great alternative - bigger stroke depth than launch/Keon, which is big deal but for most part , u need to hold with one hand, and designed for its stock sleeve
No need to consider any others really
Yes SLR and .funscript files fully supported with those