I'm never going to win a quick draw contest no matter what !Never going to win a quick draw contest with an ankle holster. I guess if you knew in advance.
for primary carry there are much better options.. great idea for a backup gun. As for brand, type, configuration a lots depends on how you dress. Baggy suit pants, jeans, etc. Back when I was driving a lot I went with a shoulder rigs
I have multiple pistols for waist carry, but sometimes waist or pocket aren't an option, so ankle is better than going without.