What is better for fail over: use both nameservers of dnsmadeeasy or just one?
I bought Managed DNS service and fail over service at dnsmadeeasy.com Now I'm wondering what is the best option: use primary and secondary DNS with dnsmadeeasy or just the secondary there and the other one in my dedicated server in hetzner.de? Remember that I'm going to use fail over service (I don't if that's matter regarding choose one of these options).
If you are buying managed DNS hosting from another company then I would use them for both your nameservers, especially if those nameservers are in physically different locations. They are DNS experts and will make sure that it is up and running.
However if they are meant only as a fail-over service then they may charge extra for bandwidth overages in which case you'd only use them for secondary, so you should check with them whether that's the case.