I have been living here for 2 years and I have seen 1 Manta Ray...Big fella....but I don't know haw many have seen me though....lol
I have never dove off the Big Island so I can't say that it's better and it always depends....You can have a great dive anywhere...like the day the pod of dolphins just swam past me while I was trying to catch up with the group that was looking for the dolphins....Or th day the whale song was soooo intense that I thought "if I turn around now I'll bump into him".....Or the day I found the tritons trumpet on the wreck and nobody else saw it....then you can have a day were you see nothing....but at least you got to dive. Every island has something going for it and with a little luck it'll be a special dive.
Air fare has gone up. Just the other day they had something about it on TV, that it costs over $100 one way....Check out the net to give you an idea of what the rates are like right now.
Keep on askin...we'll help as best we can