There are reasons to have either, but stating your need...probably the 'thumb break'...although I wouldn't use either.
I have fallen down a set of bleachers once (another story), and I sidearm did not leave its holster...leaving only a bruised ego. 
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"That I cannot do."
"Give this to, uh, Clemenza. I want reliable people, people who aren't going to be carried away. After all we're not murderers in spite of what this undertaker thinks."
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NRA Life Member
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