It depends on the task. If you run a single account that needs a consistent identity, stick to one IP, either a static one or a long sticky session. If you scrape or hit the same site a lot, a rotating pool spreads the requests. One IP looks like the same person every time. A pool looks like a new visitor on every request, good for scraping, bad for anything with a login. Mixing them up is where most bans come from, one account jumping between pool IPs looks worse than one slow IP. We're DataImpulse, we do rotating and sticky sessions, which can range from 1 to 120 minutes, not static IPs.