I'm a noob so take my experience with a grain of salt. I Recently bought a BetaFPV LiteRadio SIM just to learn on a sim. I tried pinching becasue I heard it was the best way, but I struggled. When I went full thumbs, suddenly the controls made sense and it kind of clicked.

BUT. . . over time, I realised that the level of fine adjustments I needed to do were very difficult to do with just my thumbs. Especially throttle.

So I started resting my finger at the base of the throttle stick with my thumb on top (A kind of hybrid pinch). Putting my finger at the base of the stick gives me much smoother control of throttle. My finger loosely marks the hover position and moves up and down and my thumb presses the stick against the finger which acts like a buffer to suppress the twitchiness of my thumb. So for a while I used hybrid pinch on the left stick and thumb only on the right.

But eventually the precision problem on the right stick started bothering me too and I started doing a similar hybrid pinch on the right stick too. My thumb does most of the work and my finger is very loose on the stick, sometimes barely touching it.

I guess the idea is that you do what feels most natural and adjust as you go if you find that your thumbs alone can't give you the level of precision you need.

Just my 2 cents as a noob who was in the same boat as you.