I haven't picked a favorite yet. There's a good article by Ron Wisner (I think it's on the Wisner site), about why the rule of thumb about using a lens approximately equal to the diagonal of the format for portraits doesn't really apply when you get over 8x10" and are in the macro range. I often use a lens of about 14" on 11x14" for portraits--headshots to about 3/4 length.