My experience is try to get a senior academics as your main supervisor. Co-SV can be from a junior lecturer

Most universities need you to have at least 2 supervisors. During your 3 years journey, in case one of the supervisors quit the job, change university, go overseas do postdoc, take unpaid leaves or whatever reasons, then u still have another one who know and follow your progress.

Pick one SV who is strong in the methodology that u use, another SV who is publications in your subject matters. As such it will avoid conflict between SV, as they know their boundary. Pick those SV with at lease few PhD candidates graduated under him/her as the track records.