For me this all comes down to the technique which has already been discussed. For the serious tournament angler fitting equipment specific to technique is a must for maximum effectiveness. For the weekend angler that may not be realistic or necessary. I think for a weekend and casual angler one reel would be sufficient. On that premise I would go with a spinning reel due to the fact you could get by using it with any topwater technique. You may drop a fish on occasion but it will function adequately. A baitcaster could be used for some techniques but will be very difficult or impossible to use with others, especially smaller finesse type topwater baits.

     As far as what specific type, for a spinning reel I prefer a large diameter spool for increased casting distance and less line twist. If you haven't tried one and are looking for a new reel I highly recommend trying one. I have several different baitcasters I prefer depending on the technique. I will go with a 5.3 for heavier cover and when throwing a buzzbaits or spooks / poppers. Often anglers overwork their buzzbait, sending it speeding past the strike zone. Many times you need to slow that retrieve down and keep the buzzbait in the strike zone as long as possible. If I'm throwing a wake bait I will use a 6.3. But again, personal preference plays a part in reel choice as does type of bait and technique.