Sorry, 2nd post from a newbie in the same day

Looking for a home protection shotgun setup that my wife could handle, was originally thinking a youth model 20 gauge pump shotgun loaded with the largest buckshot commonly available in a standard 20 gaage shell.

Seems like 12 gauges are a lot easier to come by, was wondering if the low recoil shells really kick that much less (enough that a 108 pound woman can handle) Any thought from someone who has shot both gauges & kinds of shell?