I admit to not being a fan of the sigma system or the Glock system. Just not my cup of tea.
I have a friend, who is in the sandbox now, who carries nothing but a Glock. Well, as a sidearm.
I would take the Glock system--I can't believe I am touting glocks--over the Sigma system, hands down.
Parts and adaptability of the weapon is an important thing too me---things you can't do to a Glock.
I have never held a Glock--or simular weapons--that were comfortable too me. I can shoot them, but, I have too work at postioning my hand on them-and trying too keep proper placement of the hand for follow-ups in near impossible for me.
I won't even get into what a god awful trigger system I think it is.
Saying all that--I am glad you and she like it---party down.
Blessings