Guess it's just whatever you're used to, as long as you get enough coverage. I skip from 125 right up to 180, but even that seems wide to me. I really favor longer
focal lengths. We all visualize things somewhat differently, and at a certain point, certain focal lengths just seem to fit like a comfortable shoe, while others don't.
I don't think anyone can devise some kind of academic formula for all this. It's pretty subjective. But I personally tend to gravitate toward the same angle of view regardless of format. My "normal" for 35mm is an 85 lens, for 6x7 a 165, for 4x5 a 240, and for 8x10 a 450. That's my photographic shoe size, or my most frequently used angle of perspective. Yours might be something completely different. The more flavors of ice cream available, the better, as far as I'm concerned.
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