Both!

I never wear heels. I did when I was young, but rarely. I would have broken my neck by now. They really aren't my style. Now that I am old, and really don't care about fashion, I wear boots, clogs, and, even crocs when I am being very lazy. One thing that endeared me to Deadpool was when he came home from a busy day of mayhem, he slipped into his crocs.

Flip flops definitely. I own heels and wedges but I haven’t worn them in over a year because I just haven’t had an occasion to wear them.

I see some guys have chimed in so I'm going to put in my 2 cents worth. To me this is indicative of form over function. High heels are terrible for a person' posture and podatriasts love them because it brings them lots of money [verywellhealth.com] . None of my partners wore high heels and I found that a good thing. My last, late partner was 5'0" (tall or short and the 0 was always present) and was definately a form over functions person. But even she drew the line at putting her health at risk for 'packaging'. A former friend had an expression about what the heels do to attract atention. He would say they really have a hitch in their get-along.
Interestingly, high heels were worn by the aristocracy. Increasingly they are being offered for men. [ecosia.org] notice the man spreading.

Last time I wore heels was to a ball/gala in 2012. I prefer hiking boots and a good pair of trainers/sneakers/gym shoes. But I tend to live in my Skechers GoWalk slip-ons.

I had the good sense to have a career which required me to wear flat shoes/boots. Heels will screw up your back and your toes. They are pure vanity and completely pointless.

Stiletto CFMs all the way! Am I rite, or am i rite?

So true.

Teva's!

Neither. I wear flats. However, I can and do trip over nothing.

Flip flops! Then I can pretend I am.at the beach

I don't wear heels anymore. Since my office went to jeans I rarely even wear dressy flats. Mostly sneakers, or birks. Yes, I can fall over my own feet in flip flops, or barefooted.