Personally I would prefer the shorter rod for accuracy and the longer rod for distance casting to cover water or deeper fishing. I too sit down most of time anymore when fishing and for me an accurate roll cast is much easier on the shorter rod. Like was said before....use what feels comfortable to you...you will catch more fish. In your situation of not being sure I would probably borrow both sizes from a friend and try them out if I did not have both sizes already in my boat.