The biggest advantage of Pantheon is a managed experience for moving sites through the dev, test, and live stages. Files and databases can be copied from one stage to another and are regularly backed up. It also works seamlessly with Git. For larger sites with a lot of developers, you can also use multidev, which allows you to create additional branched environments.
You definitely pay a lot more for Pantheon (or Acquia), so I'd only invest in it if you are using a team of programmers. It's overkill for one or two developers and will actually slow you down without providing much benefit intil you're using at least a small team
I personally use GoDaddy for all my shared and VPS server hosted Drupal sites. All hosts have horror stories about bad service (and I've read a few about GoDaddy too), but in my experience GoDaddy has competitive pricing and truly helpful tech support, even for very technical server questions. I do recommend a VPS if you can afford it, as Drupal and many libraries it uses require specific server extensions, which a shared hosting environment won't let you customize.
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