Please tell me

I have both, both are great. The syn model feels nice, seems to have a little softer touch on the p and k tabs. 

There really is not that much difference in the feel of the two in my experience, BUT you can use silicone lube or oil based lubes on the white plastic models. Silicone lube is great for long sessions.

Same here. I love both. It really depends on what mood I’m in. I like using the white plastic in the shower with silicone lube. The silicone can be applied with a lube shooter and its stay with you. Also it will hold up in the water.

The Syn model is my favorite in bed and sleeping in. The subtle touch of the tabs are perfect for me as well as the touch inside. I was skeptical of going to sleep with one but it was a win for me. I have been awakened to super Os with an amazing erection.