I'm a thumb-and-finger guy.

I've seen dozens of different grips on the transmitters with beginners, and some of them even ask me about how I do it. The right answer is always "whatever works for you".

I will say that many transmitters are laid out in such a way that some grips make it hard to work the switches and knobs.

I also happen to like to shorten my control sticks as short as I can, and reduce the stick tension way down. I've had guys who try my transmitters say they really feel funny to them. I have short, stubby fingers, so this stick arragement works for me.