i would choose co.cc. it requires manual renewal only once a year. dot tk has a minimum traffic rule of 1 visit / month else it will drop if it is not a paid domain. this rule makes using this domain very inconvenient as not every month there will be traffic to your site unless you keep visiting your own site.
co.cc is more familiar compare to .tk. so, I rather go for co.cc but I have a lot of .tk domains. lol
I think they are both the same. As long as my desired name are available I will for either for .co.cc and .tk
how true, ive seen more .co.cc around than .co.tk -if someone said to me their domain was .co.tk I would probably forget the combination where cc you think close corporation to think business or vice versa, at least it triggers your memory
If they are both free. Try both out and see how it goes. If your serious about the website, you should just purchase a .com or .co Worst thing you can do is build up the website and it takes off and you get into the dilemma of staying with the domain name or changing it down the track.
Every free service has its limitation. .tk domain needs atleast 1 visit per month and .co.cc domain will be blocked on facebook because they think .co.cc domain are all made for spam.
I suppose you should keep in mind just one thing and always remember about that: free domain name is easy to get and at the same time that is easy to lose.
co.cc is the best option go for it, also the renewal is cheapest, for first 3 years you have to pay a total of 5$ (first year totally free)what more one wants.
.TK steal your domains .CO.CC renewal is not free anymore (not 100% sure though) You should go with CZ.CC or CO.TV.