You pretty much answered your question yourself. It's all about personal preference and what feels comfortable to you. Frankly, my grip on the stick is very loose and relaxed. There is no need to grip it hard you can get out inputs easily with a loose grip.
How you grip your stick is a definite personal preference. No one can really tell you whats best for you, since we don't know what will feels the most comfortable and what lets you do inputs the best.
I know I wasn't very helpful, but you are right it all comes down to what you feel is best for you and of course practice. Getting good with stick isn't an easy task. Just try out different grips and practice. You'll find whats best for you and stick with it and keep on practicing.
