If you're looking for a one size fits all solution then continuous rim is the best to go for, it can cut pretty much anything wet.
Which specific blade to go for would be determined by the product you work with more often.
Porcelain, ceramics or natural products etc.
Then finally - budget.
I'm not exactly going to be impartial as we sell blades, so the other guys here can give you a run down on whats good value for money or the best performance.