I haven't noticed a significant difference between the two methods. It's more likely just out of convenience, ie not getting up to hit the reset button. You could also time it for yourself if you're not convinced.

However, there is a significant difference between consoles (at least PCTrax's and mine) of about 1-2 seconds. With 21 resets in the run, this essentially makes a WR run impossible on my console. Not sure what causes the difference though.