This is a false dichotomy. Masks or gloves as worn by ordinary people are nowhere near effective enough to mean lockdowns could end. They're very effective in clinical settings with proper ppe head to toe and procedures for taking them off outside the dirty ward, but there's no way most people can stick to those, nor keep their houses/shops clean enough.

I believe it's also well established that any measures taken to slow the spread of a new virus will always result in fewer total deaths

In the sense that they prevent a healthcare system being overwhelmed yes, in any other sense no, they are very much just a pause button for the spread of the virus, not a cure.