From the standpoint of the functioning of your website, it makes no difference what registrar you use. "Just as good", however, can take in a number of factors from ease of use to customer support and including price. I can't, from personal experience, compare the service of those two, though many here probably can, but if basis for the comparison is what was stated in the original question, then yes they are identical.
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Does Website speed depend on Domain registra? And What is the best registra other than GoDaddy
Other than Godaddy, you can try Namecheap. They might not be cheaper but their service/support/interface all is superb. Its excellent place to register domains even for newbies because there are no complex procedures for registering/transferring domains as compared to Godaddy.