I am trying vultr out because they have a site in Australia, where I am located.
Not as polished as DO - I really like DO - but easy enough to use. The reviews on performance are generally very good but to my eye the difference would not sway me from DO. And the pricing is phenomenal. But, again, the difference to DO would not be enough to sway me because DO (and Linode's) pricing is already really good.
Using Forge with vultr went super smoothly, though I could not see that vultr had a private ip address. Incidentally, trying to use Forge with AWS in Oz did not work. PHP did not install. Just a little thing. I've raised a ticket for TO to look at.
So if DO - or Linode - were in Oz I'd use them. But Vultr are so I'll give them a try.
What I really do miss is a PaaS in Australia. Actually, there is Rails PaaS and there soon to be a Python / Django PaaS ... but PHP PaaSs are thin on the ground. AppEngine is here but to my mind that is perhaps more IaaS than PaaS. Same for AWS EB - and I don;t think AWS EB allows for Ubuntu anyway.