Personally I do exclusively double overhand with and without straps. From my perspective unless you compete in powerlifting there is no reason to mix grip and it does carry that little extra risk with it. From a mechanical perspective you are training one shoulder internally rotated and one externally rotated which could lead issues in the medium to long term that to me are avoidable.I only started doing deadlifts again recently so I am still working back to heavy weights, but I just watched a gym fail video and am freaked out about doing mixed grip again at some point. So many torn biceps 😬