It all depends on the use case. Residential Proxies, also known as Rotating Residential Proxies, come with IPs that will change for each session, while Static Residential Proxies (ISP Proxies) can keep the same IP for up to 60 minutes. Both of them come with high anonymity.
If your use case doesn't require you to keep the same IP for a long time, we recommend you with our Residential Proxies.
If your use case needs you to keep the same time for a long time, you should use Static Residential Proxies, because those websites may flag and disable those accounts that change their login IP frequently. Under that circumstance, Static Residential Proxies are the best.