Nen, obviously.

Nen gives more opportunities to its users. Despite having a strong pull to one type, you'd still be practically capable of using the other nen types.

Nen allow create any metaphysical power if you have imagination.

You can materialize Infinity stone but with certain rules(rules is sacrifice exchange for more power , you do or not do something and that allow harness more power.).

If anyone create nen ability to make super cells or another thing that augment and accelerate human development but with exchange for .ore hunger or other sacrifice. It can grant adaptive development power that turn human into supernatural level powerhouse .

You literally can make escanor power .

Pride sin.

Day time slow but permanent power growth.(Slowly walk to absolute condition)

Nigh time : big vulnerability.

You can make passive nen power that augment training results , same shit that make Saitama overpowered.

Just train hard , not drop , and you will gain 100 times more result than average, even beyond human capabilities.

Nen is the best type of energy system created, it's what Jujutsu Kaisen tried (and failed) to do with Cursed Energy.

And it also has its own version of Stands, being able to shape which Stand you want.

Nen has been described as one of the best anime power systems

Persona sounds dumb

Me knowing I could summon God as my persona

Sir Tserriednich the goat

Persona characters are way stronger but probable nen