Electric types are the best for both purposes. They have only one weakness and are strong against 1/4th of the entire Pokémon franchise. Even though they are weak to Ground, they have many Pokémon that can counter or even avoid and check the type all together! Plus, Electric moves are used a lot for those who don't even have the STAB. This makes them the best type that has been just as good during Gen 1 as they always will be in Gen 9.
As for sexiest, same thing. A lot of the Eletric types have the morr wholesome Pokémon lines, barring the constructs. Heck, how many Pikachu lewds, plus alt, are there anyway? A lot. There is a lot. Plus, they are always energetic and raring to fuck. Even after finishing, they are still willing to keep having fun!