Other. I don't have too many Tantus toys but will say that the Ryder plug is wonderful.
I've often worn the Ryder during PIV sex until recently. I finally invested in a Pure Plug large and it is the only plug that hasn't popped out during PIV sex. Maybe the medium would've worked just as we'll for me but I have no regrets opting for the large from the get-go.
While O2 Cush and O2 Adam are nice, I definitely prefer my VixSkins over them.
Have fun shopping and experimenting!