When you print 4×6 copies for a mini portfolio…

Do you crop part of the print out so the whole 4×6 space is covered, or do you shrink the print so all of it fits in the 4×6 leaving white space around it? 

Just curious really. 

I’ve been cropping them, since we use the full print in a larger size for the actual picture study, this is just a fun record book for dd.  This coming year though seems to have brought a good amount of square or church panel shaped prints and I’m not sure what I want to do now.