No point using the tab, I find they're an annoyance in web programming because if you edit a file in cpanel for example it usually messes up the format of it when it was edited locally in another program. It's a menace.
Spaces are much easier to work with. First thing I do on any new code i work with is to replace all tabs with 3 spaces.
I need a new signature... i'm bored of the old one!