Hi.
I think its all down to personel choice as there are lots of different ones that have different size pages and inserts.
I dont like folders and prefer access to just one coin at a time in boxes both flips / capsules ,envelopes etc.
Sure you will get some ideas on here and get sorted with what your looking for.
Maybe even consider a cabinet as plenty seem to come up second hand.
Happy collecting and be lucky.
Pete.