I don't use them myself, but I only choose colocation providers that have a good handle on their own protections. A quick search, though, shows lots of reviews and options:

https://www.techradar.com/news/best-ddos-protection

https://www.gartner.com/reviews/market/ddos-mitigation-solut...

https://expertinsights.com/insights/top-distributed-denial-o...

No idea about the content of those links, but considering the amount of research I do before selecting a colo provider, it'd be trivial in comparison to research a DDoS protection service.