Depends on your budget (and I’m assuming you’re after a similar suction style clit toy that has more power rather than something completely different?) but without a doubt the most powerful suction toy I have is the new Womanizer Next. It’s sensational. You can read my full review here.
My next choice is the Melt, also very powerful and my favourite for years before getting the Next and still a better shape to hold. Both the Melt and the Next are bulkier to hold that the satisfyer but are fantastic.
Basically, I think with suction toys the most key thing is getting one with a head that perfectly fits your clit. If they don’t form a good seal with room above to work they won’t work brilliantly whichever you go for. If they do, then they’ll blow your mind.