I use spinning reels for casting, I use conventionals(even if they do casr well) for trolling,the thought process beitng,that anyone can grab the conventional if it hooks up, I'm left handed,so my spinners are set up for me,most people who fish with me are right handed...it's just make s sense for me to fish this way...
As an aside as I have stated before,I set all my drags with a spring scale,the conventionals are lever drags,people cant monkey with them,I've seen too many people loose fish because they panicked when a big fish went on a on a long run and tightend the drag on a spinner..... not good!