The good old topic...
What are good settings for the tabs?
tab-character or spaces as tabs? How many spaces? etc?
This depends on the project you are working on. Mostly you have coding rules that also define what to use. I am working on several projects where nearly all have different rules (which makes me believe this setting probably belongs to the project settings and not general settings - but luckily C::B support several profiles ;-)).
My personal opinion: I hate tabs - they are just useless and prefer not too much spaces so I choose "no tabs, 2 spaces". But that's my opinion. For C::B we chose 4 spaces with tabs and/or spaces. You see... ;-)