I like most trousers to sit around my belly button. Whatever size I've been and however toned I always have a little chonk of fat just below which I definitely do not want sitting above my trouser line, or to have the waistband squished across the middle of it. But yes, choice is the thing. A lot of shops only do one length of trousers in particular styles though, let alone different waist styles and heights! The one length is usually 29" which is infuriating as I need 31/32".
M&S women's chinos are a case in point, they are all tapered, slim fit, ankle grazing, mostly pastel shades and it doesn't even tell you in most cases what the length is. My absolute pet hate is ankle grazing trousers, particularly in winter. It just looks like your trousers do not fit properly and are neither one thing nor another. And when it's single figures in temperature I do not want draughty ankles, or to wear pastel shades in winter mud and wet weather.
www.marksandspencer.com/l/women/trousers/fs5/chinos
No doubt next year they will add "low rise" into the mix. I ended up getting a couple of pairs of the men's as I could buy them based on measurements, and they were sensible colours like navy blue and black.