I have a 2 piece snap on cover. i prefer it because you can use only the bow cover on those cold mornings and i have the poles to put under the bow and main cover when it rains. The big cover tends to puddle and i find it cumbersome. Also I moore my boat so the snap on covers jsut make more sense. The down side is the snaps and you do not completely cover the colored gel coat which of course fades quicker over time.

BTW Sunbrella material is what you want to go with.