Fuel usage SHOULD be much less with the twins !
Mid range MIGHT be a little better with the triples ?
Docking will be easier with triples as you have a WIDE "track" to use ... just shut the center one down while docking !
The big benefit to having triples is the ability to "run home" on two if you loose one ... This doesn't suck !
The boat will feel more stable at speed as well "wide track" again !
Did I say you will USE alot more fuel with the triples !!!