What power system would you like to learn? You can only pick two

Probably either Stand and Quirk or Magic and Demon Weapon.

Alchemy and uh Magic

Quirk and Alchemy

Stand and quirk

If I get a op quirk or stand, then that's what I want
If not, I'll just take ki or chakra

Quirk

I would do devil fruit with Ki

Devil Fruit and Stand

Easily nen

Stand and Devil Trigger

quirk and alchemy

Ki (cause I can learn super saiyan or some shit) and stand

Haki and ki

Nen and Quirk.
If Breathing Style was there, I would have chose that and Nen instead of quirk.

Stand and restaurant I'd get silver chariot and then teach myself banki

Restaurant 💀

F**k auto correct you knew what I ment

For me, I'd pick ki and haki

Ki from what I understand has no restrictions, unlike nen and alchemy, (minus the user's body determining how much ki they can use, but you can increase that limit through training)

And for me, haki is my second choice because color of observation, if trained enough, can let you see into the future for a short time and color of arms imo is probably more versatile than ki is...perfect offense and defense

Haki and nen