I think it somewhat depends as well if you want to get involved into handling your own server/vps or you want something more PAAS.
Overall I've used DO, AWS, Rackspace and others, and all cloud providers at times suffer from the 'bad neighbour' effect :).
I even had to argue with rackspace to move me to another node, considering I stopped all traffic, the firewall allowed only my IP over SSH, but the vm had a load over 4. All good after that got moved though.
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I think it somewhat depends as well if you want to get involved into handling your own server/vps or you want something more PAAS.
Overall I've used DO, AWS, Rackspace and others, and all cloud providers at times suffer from the 'bad neighbour' effect :).
I even had to argue with rackspace to move me to another node, considering I stopped all traffic, the firewall allowed only my IP over SSH, but the vm had a load over 4. All good after that got moved though.