if you could join a kpop company, which one would you choose?

Not just one. I'd work with a lot of them as a consultant.

I would hate to be an idol due to the pressure (I am a very anxious person lol)

But I would choose BigHit for sure

SM as an educational learning experience for their proper training and in hope of meeting their many cool artists

then I will just quit lol (since this is all imaginary, I will also pay the debt by my imaginary money)