Blind stealing

[Colombo]

When stealing blinds, there are too techniques, the normal raise (3x-4x the bb) and the push.

How do i know when to use these two moves?

At what BB:Stack ratio should i stop raising and begin pushing. How does my opponents stack affect my decision?

And i really am not looking for answers like if ur stack is <10BB. I know that stuff, I'm looking for answers just to do with blind stealing.