HTTP/S What factors should I consider when choosing a residential proxy provider?

[Rola proxyl]

I'm researching residential proxies for market research and web scraping.

I found many providers claiming they have millions of IPs, but I'm not sure which factors actually matter.

Besides IP pool size, what should I pay attention to?
- IP quality?
- Success rate?
- Location coverage?
- Support?

Would like to hear your experience.