I use both
For design, video, photos or anything else creative I use a Mac. I also prefer to use the Mac for general web surfing, email and other regular things
For business and finance, I use PC.
Also, for casinos, it has to be PC too. I think the only 100% Mac Compatible casino software out there is Wagerworks, isn’t it?
I’m not sure about PCs being more powerful, it really depends what you use them for in the real world, rather than mega and giga numbers. One thing for sure, is that you can buy very cheap PCs and they are generally more upgradeable.