IMHO i dont like EVF. most of them are very very lousy (except on the S7000, which I love...) and grainy. with some exceptions. Optical viewfinders give you a very clear image. its also a lot easier to manually focus. i also dont see why the EVF is so important since all of the relevant information (i.e. aperture, shutter speed, etc.) are all listed under the optical VF. But i guess on some cameras it is impossible to install the required mirrors. Only on SLRs...
I think we need to know the context of the question - are we talking about DSLR or non-SLR? If non-SLR, whether the view-finder is optical or EVF?
If non-SLR and optical, then should try and use LCD since usually the LCD is a more accurate representation of what you are going to take. In any case you won't be able to do TTL manual focus so no point.
If non-SLR but EVF, then its really up to you. But should try and use the one with more resolution. If I remember correctly, the F828 has a EVF that has a higher resolution than the LCD screen.
If DSLR, then there is no choice. With the exception of one or two specific models, most DSLR have only got view-finder.
previously owned a s602, use the EVF in a dim lit room...though my eyes can still see the object I'm goin to focus on, on the LCD or EVF it shows all dark...as a matter of fact It cannot be focus...and also It poses another problem, manual focussing defeat its purpose totally...u can't see how r u goin to manual focus?
I heard from a friend of mine that Optical viewfinders have a bit of angle error? Yes, I believe the using the Optical Viewfinder, you get what you see...and that's where the real skill comes in isn't it?