There are fewer barriers with helmets because they are usually tinted.
I’m a fan of anything that keeps eyes more forwards/on the road.
Hololens is slightly more advanced. At least the last I saw it uses waveguides etc. to overlay the content over a transparent panel. Much like Google glasses, but way, way more advanced (and therefore justifiably expensive - last I saw, again, it was something like $15000). AVP is no different to a $300 Quest (plus internal cameras for iris and expression tracking and obnoxiously bad FOV) - it’s 10x Apple tax.
Hololens is still alive and kicking btw, but it’s exclusively enterprise.
I have used both C and Rust for embedded. Rust is significantly more enjoyable. https://embassy.dev/
C is good for nothing.
And once again, I am seriously questioning Apple’s privacy claims. Why else would Apple build such a moat around Safari?