Of course Codechef is the best among two.As Codechef is a indian brand we should always respect indian brands and more codechef gives you opportunity to learn more and more things .
Codechef gives you goodies for your performance enhancement.
So,in my views Codechef is best.
Is this the right place to ask so? Try making a new question.
SPOJ is spoiled after making problem setting open. It is not good for practice anymore.
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I think codeforces is better because contests because it has large number of contests as compared to Codechef and rating system is so quick
well that ranking feature is also awesome !! . just make the CF user ur friend and during any ongoing or virtual contest u can see his or her ranking and compare with urself :)).