Good question. Fuller's strain in a recipe with a lot of EKG will give you big fruit. If you only like bananas, some of the Bavarian weizen strains will crank that out in large quantity, as will Westmalle's. The Chimay strain is pretty fruity in general, though it throws some phenols as well, which somewhat take away from the prominence of the esters.
I guess a follow up question is, does it matter what kind of fruit?