I have both. The regular size is pretty big. 13" wide x 11" tall and 5" deep. The mini size is 11" wide x 10" tall x 5" deep.
Most people prefer the mini size for a regular purse. If you have someone who carries everything but the kitchen sink in their purse, I'd recomend the regular size.
Watch out! Those bow tuck bags are very addicting. I'm working on #9 now. :D