As system administrator myself I prefer to use A record over CNAME. Simply answer on why question is : fast.
This post came when I have problem with setting blogspot custom domain, I put right entry but still not get resolved. I ever use it many times and wondering if Google also give A record for blogspot and they did.
Yes, its my fault for not re-reading google help page and I found these IP :
216.239.32.21
216.239.34.21
216.239.36.21
216.239.38.21
awesome.
I can use those IP.
Using A record for blogspot custom domain with cpanel
Login to cpanel and find Simple DNS Zone Monitor.
Choose domain
Find “Add an A Record” section.
Enter name and address (repeat for all ip)
Click Add a Record button.
The result will be like this picture
Simple click proof the address for you 🙂