I've got some old projects running on Rackspace. Did you move away from Rackspace? If so, where'd you move, and how do you like it?
Hands down expensive as hell but AMAZING support.
For Linux... Inmotion Hosting
Reasonably priced, but UNBELIEVABLE support.
Seems like everyone working at these two companies is a wizard that put on their robe and hat before work. When you pay for hosting you want someone on call and smarter than you for when things go south.
Their infrastructure feels like using a couple of half disassembled servers on the floor. Their platform is fragmented to pieces, they have no idea what a "design system" is, and you have to log into like three different webapps to just play around with your server.
They are literally in the same place they were in on day one, playform wise.
If you're nostalgic for some 2006 era hosting company, go with InMotion.
Back then Invotion/HDC was kind of shitshow, so I left and spent a couple years at Rackspace...
Pantheon for most Drupal sites. Amazing service. Should have made the move years ago.
Platform.sh for some Drupal sites and for various NodeJS projects.
Various CDNs for asset serving.
Almost everything is available now "as-a-service". The case where a custom server that you manage via SSH is the best solution is now the minority.
For years, Rackspace provided amazing sysadmin support, but there was always a gap between where their support ended, and the best practices for WP and Drupal sites began. That included tuning the LAMP stack for those applications, configuring dev sites and deployment processes, and managing caching and TLS. Rackspace helped with general advice, but we had to "do" it, and maintain it.
That's not true on CMS-specific hosting like WP Engine and Pantheon; it's all in one package: production hosting with scaling, dev and staging sites with one-click sync and deployments, CDN, TLS certs via Let's Encrypt, and support. We went from spending almost an FTE's worth of time on sysadmin and dev ops, to almost no time on those things.
I'd say I wish we had done it earlier, but in my opinion, we could not have. It has only been within the last year or two that these services have really put together the full feature set we wanted.