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.