Best CTV advertising platform/DSP?

I have never run a CTV campaign and am just trying to find out what platform is the best out there? I have access to CTV advertising using dsps like dv360, ttd, xandr, stackadapt and even amazon. But then there are options like GumGum, Samba TV etc.

Lets say I have a video from a client and budgets would meet any platform's minimums, now what platforms would I use to target specific 1pa/3pa/demographic/affinity/contextual audiences and be able to track campaign performance?

Thanks in advance!