I can't speak much to the sigs , but as far as iwb, i have to say as well as a few others, The Remora Holster is amazing , it gets alot more attention than my crossbreed supertuck, im taller than you, and i can manage to conceal a Glock 26 IWB semi-comfortably, alot of people when i do carry the 26 in just a set of loose jeans and a fitted t-shirt , can tell im carrying. i once carried to Harvard to meet a friend , and he didn't know i was carrying till i unholstered it and put it on the table, hes like where you carrying that the whole time lol. , i love that gun, it shoots amazingly easy shooter for a subcompact 9mm. plus my backup high cap glock 17 mag fits in it, which is why its my main carry gun. but due to weight , it ends up in the remora holster, wedged in my purse, which might not be the best idea for everyone, but i like it, plus the remora grips the side of the purse and its easy to pull out of my coach bag
idk i like my purse carry , im carrying 80%+ .
honestly try tons of guns out and see what works best for you,