If you're referring to drinking, glass for glass, alcohol vs a mixed drink, that depends on what you consider regarding the words drunk and faster.

I've noticed the effects of alcohol with diet drinks faster than with alcohol alone. I've noticed mixed drinks with high-fructose soft drinks only marginally, and the fall-off seemed faster.

I imagine if you were to drink, ounce-for-ounce, a glass of alcohol vs a mixed drink, that the MAGNITUDE of your drunkenness would be larger, but the speed at which you achieve that could conceivably be less.

And but the make-your-own sodas (the kind you get as a christmas gift, with the built-in carbonator) seem to be devastatingly effective at causing over-consumption. You expect the alcohol to wear off as with an off-the-shelf soft drink, but you stay AS drunk as if it were straight alcohol.

I've read, but cannot scientifically confirm accuracy, one observation about why this happens. Many of the make-your-own sodas contain cane sugar instead of the off-the-shelf brand's high-fructose corn syrup as the culprit.