question about dns

hello, I have a couple questions about dns settings. Let's say that I have a website that I need to be up 100% of the time. So I have 2 accounts at 2 different hosting providers (1 primary and 1 backup). So I was wondering how I should setup my DNS? What are some advantages of setting the dns up in the following way?

ns1.firsthost.com then
ns2.firsthost.com
ns3.secondhost.com
ns4.secondhost.com

Or should I go
ns1.firsthost.com
ns3.secondhost.com
ns2.firsthost.com
ns4.secondhost.com

Thanks
Steven

 

 

 

 

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