With card pages, you will need to slip each card into each pocket, while with a box you can sort your cards into stacks and then just drop those stacks into boxes
If youre even remotely interested in Pokemon cards, buying four or five of these lots puts you at 200 to 250 cards for $20 to $25, an immediate collection with high trading value.
Cloyster #41 (Pokemon Sword & Shield | Pokemon Cards) prices are based on the historic sales
Mox Jasper (Serial Numbered) - $1,500 The top-earner from Tarkir: Dragonstorm (a great set, by the way), Mox Jaspers serialized version is numbered up to 500, pushing the value up to around $1,500
You find an old box of cards in a drawer, you inherit a collection, or you come home from a garage sale with a hundred cards under your arm