The first thing to consider is: what do you intend to use the craft for? How many people/ what weight do you want to carry? What space do you have to store a craft, as they vary greatly in size? What your budget is?
There are pro's & con's for single or twin engine craft, I've had both. My personal preference is single engine (50% less to go wrong)
I'm not sure what part of the country you are at or if you have any experience with hovercraft, but the best way to find out what craft suits you best, is meet up and go out with hovercraft owners, to see what hovercraft suits your needs. They vary greatly is size, performance, noise, carrying capacity, comfort etc.