Going through them would be a book in itself (The ARMv8 reference manual is itself a couple thousand pages, which I have only gone through a fraction of). I think RISC-V is the closest thing to what I would like in a simple general purpose ISA, even though it is not perfect (no branch delay slots, no post modifies/register writebacks, don't like the immediate encoding). It is a hell of a lot better than the mess ARM made, and the basic (IMAFD) instruction reference can be kept to a single page ;)