Depends a lot on the skills of every person. Personally i like stability, so I would choose the job, plus I dont personally own any popular website.
Best
Affiliate program with limitless profit is possible only when you have a very popular website visited by thousands per day.
It all depend on the topic you choose. As well, choose affiliate program with revenue share, where registered customer is your forever.
Good luck!
I would stay on the job with stable pay but maintain my affiliate program with as much outsourcing as possible. Of course, this is the most ideal situation!