hello,
some of my friends prefer to buy domain from Godaddy while some say to buy from NameCheap... which one is more better and how ?


thanks in advance for you opinion...

IMO, both are good reliable and reputed domain registrar. However, I would suggest Godaddy if you are choosing only one out of them.
The only difference, I observed is that GoDaddy $8.95 and NameCheap $8.88. Namecheap is cheaper by 7 cents. :)