Agreed with the experimentation, it wasn't until I tried handwriting that I realised typing caused me to retain less information. It's less about what's 'most efficient' for others, it's about what works for you.
As for physics, I handwrite notes and use whatever format I feel is more...
I won't give my assignment to someone else if they are copying it; I'd say that they have to learn the subject themselves/learn to manage their time. If they just wanted to have a quick look for comparison, that's not a problem.
I'll be happy to explain to them if they don't understand it and...