what is your target visitor With co.uk google will targeting your site to uk only so if you want to get global visitor you should use .org or .com
Definately a .com is way better than a .co.uk! As they say ".com is king" & it's worth a lot more than the equivalant .co.uk. Sure the .co.uk is very strong in the UK but .com is global.
.com is better unless your site is specific to the uk... even then the .com might be nice to have as well to protect your name globally.
.co.uk or .com? -> .com defenetely: global with more visitors .co.uk or .org? WHICH IS BETTER? -> depends on your niche: If you want to have more uk visitors go with .co.uk, otherwise choose .org .com is overall - .community, -> the best! .org the second - .organisation .co.uk only for uk