Bad relationship with PhD supervisors, should I have them as my recommenders in job applications?
Not having the recommendation of the PhD supervisor is going to raise some flags, especially in academia. However, you can get recommendations from other senior people you collaborated with on research papers if you published any. Those people should be able to write decent recommendation letters for you. If you apply for non-academic jobs, you could also ask for a recommendation letter your boss from a previous job if you had one, or your diploma/masters thesis advisers.

Also, if you only have your supervisers to write you recommendation letters, you could still ask one of them who seems nicer. Even if they don't like you and think you're incapable, they would like it even less to have an alumnus flipping burgers. So, they might write you a reasonable recommendation for a non-academic job even though they might not be willing to give you a good letter for an academic one.