Really simple and functional CI environment. Nice local development env using platform cmd. Great support team

All of it :-) We've migrated almost our full stack to Platform.sh, and as the platform allows us to manage almost every aspect of the hosting, we had no trouble at all. It's only in rare cases, we tend to reach out to Platform.sh excellent service (Slack, tickets,...) to help us out. Edge cases where we need complex architecture are figured out together, where all P.sh engineers are almost fully dedicated to help us out. I'm not sure what to list as "best", this kind of service or the product itself. Probably the combination of both. Projects running on P.sh are almost zero-worry and we can give some really good assurances to all our clients.

Easy to use on a daily basis, best performance, fastly learning