Both Riccar and Simplicity are the same machines. Riccar comes with a reusable shakeout bag while the Simplicity uses disposable bags. Riccar is more expensive but comes with a extra year of warranty. And they're both different colors on the bodies. Supposedly they both still use the same 700 watt motor like their previous models. For the Orecks, really the only differences between the two other than the shapes is that the newer one can use a HEPA filter. But they both use the same 450 watt motors which means they're definitely weaker suction wise. Having used and sold all of them before. I'd recommend trying all of them out at your local dealers if you're in a market for one and see which you'd like better because there's also a difference feel wise as well. Personally, you can't go wrong with either machine. If I had to choose any one, the Oreck HEPA is what I'd rather go with.