Hi Regiment,
3 wheeled- gives a greater throat depth allowing precise cutting out of boards- a little like a beefy fretsaw in practice, but generally have little if any vertical height adjustment.
2 wheeled- gives greater height adjustment sacrificing throat depth- means you can whittle down a 5" square post into 2.5mm X 6mm planks.
I've had a the SIP 10" two wheel bandsaw (Record/Axminster/DeWalt all make the 'same' model with different branding, and very different pricing!), and had no trouble at all, there are lots of blade choices, it has ample throat depth and height for almost every model boat application, has a good 1.5hp motor, it has three roller bearing blade alligners, blade tensioning and linear adjustment aswell as blade brushes for self cleaning and a 3" dust extraction connection on the rear.
Word of advice- you can pick up bargains where bandsaws are concerned- but just check on blade availability first.
I'm not sure, but I bet there is a woodworking forum somewhere that has reviews on them all.
Happy shopping...
Greg