Tj style u guess, my preference is menudo rojo. I used beef feet and marrow bones for a nice rich broth, I've heard of people using pigs feet too. For red, you just rehydrate dried guajillo chilies, I used a mix with an ancho and a few arbols for heat, and blend then and run it through a sieve into the broth. It's actually pretty simple to make.
I wasn't aware people ate it white until I had a neighbor from Sinaloa, his wife made some for me and I was

Guess like you say it's regional. Some people use pork feet, and some don't even use hominy. For me that's a must
Edit- hmm, rereading your post, not sure on the origin. Maybe it's regional to az, influenced by Cali or texmex. All preparations I've had here in AZ in restaurants (typically only weekends) all were red and include hominy.