My wife has the Wave and I'm pretty impressed with it; my mother, on the other hand, got the Vivaz (not the Pro) and I was less impressed with the phone. From a hardware point of view, I'd say the Wave is ahead in terms of a nicer screen, pretty much equal camera with better video recording and better materials. From a software point of view, the Bada experience is definitely smoother and more intuitive, though the app store is not as well stocked as Symbian. If you're familiar with Symbian and really like the idea of the hardware keyboard, the Vivaz Pro could work for you, but otherwise (and especially of you're new to touchscreen phones) I'd say the Wave is the better bet.