I really like the 4x3 format, ends up being a square page, which really lends itself to curating pages. I recently completed my Charizard spread of all Charizard arts from 1999-2009. Of course there are rarer 1st edition variants to some of my collection, but the overall look of the page is the same.
Currently working on a Neo Destiny spread, which conveniently has 8 shinings and 16 holo which will perfectly on 2 of the 4x3 pages.
Look forward to seeing your complete pages!