Well... the ergonomic nature will depend on the shape, not the material, and it will also be subjective. Proposed solution: Hold it before you buy it. If it fits your hand, it's ergonomic (for you.)

Metal will take and release heat quicker than more refractory materials, among them ceramics and porcelain, which will take heat slower and also hold on to it longer. It will also depend on mass, so the thicker the vessel, the longer it'll hold the heat.

I'd think you'll end up with a dinged nickel bowl, rather than a chipped porcelain one if you don't fix what led to the chip to begin with. It may be as simple as putting your bowl elsewhere, but only you can determine that. Perhaps being more deliberate when you move the bowl may help.

Whichever way you go, best of luck!