I switched from 12 mini to regular 13 and feel that i was losing so much by going with the mini in terms of the screen and info absorption.
Maybe there is a difference with other sites, but two that I checked, including MR, the only difference between a 13 and a 13 mini was that on the 13, I had two extra lines of text at the bottom. The width of the 13 was totally unutilised over the 13 mini. It was shocking to see that level of laziness. Call it what you will, but Android phones utilise the same width so much better. Since the only difference with the larger display was two extra lines of text, and I am currently not having old eyes that need larger text, I gladly saved USD 200 and went for the 13 mini.