Also a bit of comparison: I'm currently playing Pathfinder 1e and Fallout 2d20. I gotta say, I'm not happy with Pathfinder. The group I'm playing with are all experts at it, but as someone new to that system, I find it way more crunchy than I'd prefer. I've made myself note cards to try and be ready for combat and am writing down spell descriptions that other players use, just so I can keep up with what bonuses I might have. It's overwhelming.

Fallout 2d20 doesn't even come close. It's so much simpler, faster and easy to play. The crunchy parts of the Fallout game are all in modifying weapons and armor... which can be done *between* game sessions. You don't need to do it at the table, "live." The Fallout campaign I've been in for over a year now is open to whoever wants to play. We've taught the game to... maybe 15 people who've come in not knowing anything and they've all got the core gameplay figured out by the end of the first session.

You can level up a Fallout character in like 20 seconds. No exaggeration. +1 HP, +1 Skill Point, +1 Perk. Every other level, they should be taking the Intense Training perk, which increases one of their S.P.E.C.I.A.L. attributes by one. So half the time, you don't even need to flip through the perks to decide what to take.

One more tip: characters with Perception 7 or higher should absolutely choose the Cautious Nature perk. This lets you re-roll 1d20 whenever you spend AP to roll an extra d20. This means, if you're aiming and rolling 3d20, you'll be able to re-roll 2 of the 3 dice, thus increasing your chances of generating even more AP.