I use whatever kind of rod/reel combination best gets the job done for the type of fishing I want to do. So on my boat I typically have a fly rod/reel, and rods set up with bait casters and spinning reels. As noted above some people just find casting a spinning reel easier so that is what I give them. If I'm casting light gear I'll usually grab the spinning rod. If I'm throwing a fly its always the fly rod Trolling gets the old Penn 109 on the old Eagle Claw glass.

If I'm fishing on my friends bass boat it is exactly the same. We'll pitch heavy jigs with the bait casters and carolina rigs with the spinning rod. We'll also pitch gitzits with the spinning rod. So it all depends on what type of fishing you are doing and how comfortable you are casting the rod.