I am a TFF kind of guy, It was natural for me to grab the sticks with both thumbs when I first began and after all the pivot points to the center of your palm I guess kind of like using a track ball. The problem is that I think it's unstable, kind of like trying to balance a pencil on your finger. You're pushing down instead of the direction you want the stick to go.
So the first thing my instructor tought me was to use TFF. I've been flying that way for 14 years now. It seems that we have only had one instance in this post where someone converted to TO and liked it. Personally it seems to me that TFF has more control - although I admit it seems like more hand movement. I tried TO recently and nearly crashed the plane. Had to switch to TFF real fast LOL.
All this talk of a tray has me intregued as well. I use a neck strap, but will consider a tray.
RickP