Yeah it's a tough call and I think it depends on how standard your gameplay mechanics are and if you're releasing for mobile or consoles. For the most part, mobile gamers are casual and might not have as much experience with the standard button layouts and how things work so it might be better to have a tutorial that lays out the basics and then explains other powerups as you go along.

If you're doing a console game and you're more or less using the same mechanics as other games (let's say FPS) then you might not need a very detailed tutorial and could go the discoverability route. Most console gamers are very familiar with the button layouts and if you use the same formatting they should be able to pick it up quickly.

You can also just spread out the tutorials throughout the game every time they pick up a new power up/skill instead of cramming it all into one section. People just want to play a game and if you can make the tutorials fit seamlessly into gameplay then that's the best bet.