I studied some of this for a talk I gave on motorcycle crashes and some it may extrapolate. You decide.
High speed high energy crashes are what they are. You can protect yourself completely but you will look like a tech defusing a car bomb! Most crashes are falling from riding height to the ground. Forward momentum adds little energy (some but not as much as one might think) to the equation unless you high side or hit something before you scrub off all of the forward momentum. Thus, that is what helmets are best designed to do. Left side of the bell curve so to speak. MIPS may or may not help incrementally but some magic bullet, not a chance.
So buy a decent helmet certified by somebody. If it is not comfortable you likely won't wear it so make sure of that. Replace it every 5 years. Go out and enjoy. Some of us will have a horrific crash and live out our days eating through a tube. Nothing will change that. The alternative is to cover yourself in bubble wrap and never leave the couch.