either

Mostly I prefer thrusting. Sometimes if I'm going for a longer session I'll do some clenching for variety, but in order to come I need thrusting.

Clenching works best for me.

I very rarely thrust while masturbating, it doesn't usually feel good.

What feels really good is leaving whatever I use inside me & sometimes pushing it in a little bit, like a rocking motion, but not pulling it out at all. All I have to do is touch my clit a little & boom! If I don't touch my clit, it takes longer to orgasm, but it happens.

I guess this makes me a clencher masturbater. However, I'm a thruster when an actual penis is involved, go figure.

Clenching most of the time especially solo with a real intense vibe inside and out, oh yeah. On occasion thrusting too but not that often.

Thrusting and hitting my g-spot. Clenching when I've got a toy inside me can be uncomfortable, and doing it when I'm thrusting at the same time can hurt

I like both. But when I got closer to orgasm, I prefer clenching.

I don't have orgasms through penetration, so I like clinching a toy while having the Hitachi on my clit.

Using rabbit style dual toys - my wife enjoys the clench. Since we've started using dildos - thrusting is more typical for her now.

Both

Clench and thrust. It wouldn't let me vote for both.

Either. Usually clench though..

Both, I guess. I typically need some thrusting action to get close to orgasm, but then once I'm on the edge, I'll usually stop thrusting and just contract my pelvic muscles around the toy. Often I'll also press the toy firmly into my G-spot while squeezing it....although it depends on the toy. Not all toys work well for applying firm, steady G-spot pressure (in fact, a few of my very favourite toys are too soft/flexible to do so). I also have several thrusting vibrators, so with those, I stick with the thrusts all the way through to the end; it's not like I pause right before cumming to turn off the thrusting.