FWIW
Pistol grip radios here. All I have ever used. Always wanted to try a stick radio, though. Availability, expense and compatibility has held be back thus far. Be interesting to find a comparison study on surface stick radios somewhere to help in the decision making process and resolution of [possible] compatibility issues with pistol grip transmitter/receiver packages.
A lot depends on where you are in the world. Here in the US, pistol grips are the go-to. Asia, stick radios prevail-at least they used to. I got my start in RC while posted to Korea. LHS in Seoul did not even stock a pistol grip on the shelves. Stick was all they would sell me. Ended up mail-ordering a pistol grip from stateside.
Hope this helps. Cheers. 'AC'