first of all i would never do a lifetime membership myself , i like to switch, most of the times i either have a monthly or three months sub on occasions a yearly, The longest i had a membership was i think for two years with a monthly membership on SLR before i became a scripter for them.
A membership i have at the moment is VRbangers but when it expires i will switch again probably czechVR (or if they start to produce many VR scenes maybe brazzerz).
For you i would check how many free scripts there are for each site, but i would start with a sentinel or husky scripts as they tend to be good so you can feel the difference between good ones and maybe not so good ones.
As i am a scripter posting on SLR i have a membership for SLR but would also kept it if i hadnt become a scripter as it is a network site you have acces to many studios SLR, VRbangers virtualrealporn, realjam (which is my favo studio of the moment) and vrhush to name but a few. some great others, small but for everyone there is something you will like.
SLR and Realsync have the highest quality scripts as they are led by two people that have a lot of experience scripting. On SLR all our scripts go through quality control to make sure they are timing wise accurate (you dont wanna know how many times i had to re-edit my first few scenes simply because they weren’t good enough). And i think the same goes for realsync. (but they are almost all single axis, multiaxis scripts are almost only free ones here).
I dont have a SR6 so i do not know if connecting that to SLR is as easy as the Handy.
But you can check this link https://discuss.eroscripts.com/t/how-to-connect-your-147-sex-toys-for-interactive-2d-and-vr-including-the-handy-fleshlight-launch-kiiroo-keon-vorze-lovense-and-more-step-by-step-guide-with-pictures/8275/64 it should be the same as the osr.