I doubt I'd ever use Victor.
Amani seems okay. I think her opening abilities are much stronger and more likely for me to boost her with than her later abilities. Promoter I'd only use for keeping down on rebellions from capital cities that I take, because that gets annoying.
Moksha I admit makes religion much more likely for me to invest resources into. But just like all things with religion, it's optional, so all of his abilities could just be ignored and you can get arguably better abilities from different governors.
Magnus seems very situational. Some of his abilities seems very powerful in certain circumstances, but in others, the ability is a waste. I can see a warmonger like myself rushing to Black Marketeer immediately to prevent the need to find Iron. I can see an expansionist spam settlers in a high hammer city without having to lose population growing it. I can see Industrialist being very strong in pumping out units in cities with lots of strategic resources. But if you're not harvesting, settling, or building units, well, not too useful, is it? I think it's funny that his final promotion is just to roll back IZ range to its vanilla state too.
Liang's extra builder charge at the start is okay, and would lend well into creating cities specifically pumping out builders in the early game. The 30% production in Infrastructure -> Zoning Commissioner seems incredibly value in boosting new cities, but slightly less useful later when your cities can produce fine on their own.
Pingala straight up comes off as a governor you put in your capital and never move him out of there. Connoisseur/Researcher -> Grants seems like a no-brainer for any large capital.
Reyna honestly, to me, seems only worth it if you pump her abilities to the max. The ability to buy districts is nice, but it's a really weird bonus to give because of the weird district cost formula in this game. Curator is fine, but only in one specific victory condition. Tax Collector seems like it would likely give you less GPT than the abilities preceding it, which is weird.
So if I was to rank the governors in general, just based on what I'm seeing, I'd go (from most likely for me to use to least):
1. Pingala
2. Magnus
3. Liang
4. Amani
5. Reyna
6. Moksha
7. Victor