You can add Softlayer and 100TB.com also
Especially Softlayer has very robust network and good support.
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Depending on your budget there should be better ones around.
You already listed 2 where they are not really known for their great support, they run a self-service dedicated server company where you should be able to manage most on yourself.
If you really need support, then I would not opt for ovh or hetzner.
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