domain record ?

[mmccaws2]

Hi

In setting up domain records, one usually sets up a record for the
domain itself.  Like there are A records for google.com.  Would there
be an issue for not using a cname record for a domain record?

@                                                       A
192.168.199.199

vs

mydomain.net                                       CNAME    www.mydomain.net

Thanks

Mike