I love Flex-On because not only customize them but they are very comfortable and they grip super well.
I don’t have a favorite brand but I do like safety stirrups
I like my Korsteel Foot Free Irons. They were decently priced and they keep my foot very secure. I find them comfortable, and they keep it so my foot never gets stuck.
Jin Stirrups are amazing! They are extremely light weight, they have a slight angle so your heel is always down and they have grips on them so they can’t slip