I think it all comes down to personal preference I have a tri-axle trailer that tows great going down the road but gets a little tricky in tight spots, the worst seems to be gas stations if you can't find a truck stop or somewhere that has lots of room. I've never had a problem at a boat ramp they always seem to have plenty of room and you'll get use to how they turn. like someone else mentioned it might give you a little more security having three axles in case you blow a tire and have to limp somewhere to get it fixed. Tandem axles are much easier to maneuver as well as cheaper to maintain. As far as how they pull down the road, if their set up properly you shouldn't notice the difference. So it all boils down to what you want and are comfortable with they should both preform equally as well.