tbh I dont even know myself cause i only have a5 ones but i feel like the a4 have better view but i would worry about organizing cause i do pobs by fits & group album pcs by members so idk how it would work but in a4 you can actually pick if you want 9 slots or 7
in general i prefer a5 binders. most of my collections aren’t that big and i think it’s a lot easier to make a pretty layout with a 4 pocket page. but I think a4 can look great for larger collections or collections were you collect a lot for one idol. i also think a4 is great when you collect your top 3 in a group, i always think that looks really satisfying. also i love a 6 pocket layout !! i’m going to be putting my hearts2hearts top 3 collection in a 6 pocket layout and i can’t wait to set up my binder 🩵
I also have an A5 binder and I love it since my collection isn't that big, but I want to see a complete photocard set on the same page, so I thought about trying A4. Not right now, though. I'll wait until my collection gets a little bigger
I always thought about this lol cause I had 5 pocket pages in my first binder, but I decided to get A4 pages with 9 pockets later and I love them sm, they kinda make your collection look bigger lol, but good thing about A5 binders is how every photocard seems more special because there are less pcs on one page
I always prefer 4 pockets, but I think that's because the groups I stan are mostly 4 to 6 members (looking at you seventeen 😒) so I think it fits better!
I also use A5 but since my favorite group has 7 members, I wanted to try A4 because I think seeing a complete photocard set on one page would look amazing