Because rare slots are split between Holo Rare, Pokemon-ex, Secret Rare, Shining, Crystal and Gold Star tiers (depending on the era), individual ultra-rare odds can run an order of magnitude lower than headline 1-in-3 holo-slot rates
Ultimately, it comes down to personal preference, but some designs are more popular than others
The more attacks you can deal extra damage on, the more Energy counters you'll have stocked up for later in the game
A set with a clear story can stay easier to sell than a technically similar set whose top cards feel disconnected from the product
Bundles and Scene Boxes include Play boosters (so they could contain Marvel Universe cards, at the same 1/24 Play booster rate)
Blue-Black-Red-Green (UBRG) "Chaos" Blue is eager to discover the results of empirical experiments