>>50988024Booster Boxes are just a case of 36 packs. I think there's a generally consistent pull ratio in the sense that you can usually expect at least one secret rare, but I'm not sure whether there's actually anything to back that up. It's the most expensive option, but it's a good starting point if you just want to collect the set itself. Not such a good option if you're aiming for one or two specific cards.
Elite Trainer Boxes generally come with 8-10 packs and range around 40-50 dollars. There's not much to say about them. Just packs with some sleeves, dice, counters, etc. Occasionally there are promo cards too. They're not the most cost effective option since there's a slight upcharge for the extra goodies, but they're nice if you want the box to store the bulk from the set.
Buying singles is the most cost effective option for cards you want. Sure you MIGHT get that rare alt art in a 4 dollar pack, but the odds lean much more heavily towards you spending more trying to pull it than just buying the card itself. Opening packs is fun, but at a certain point you've just gotta consider that the 15 bucks you're spending gambling on packs could just go straight towards that 20 dollar card you'd be happy to pull.