I didn’t get the info from anywhere beyond my own experience.
They can. There are many different flavours of energy in the universe that both angels and demons can manipulate, but some are simply better at it than others, and in my opinion, demons excel at manipulating denser energies more than angels.
It’s better for some things, less so for others.
It’s rather difficult to say what is “better” because there are too many variables involved. We humans suck at seeing the big picture, and demons and angels have a wider perspective, so they can see when a particular energy is needed. They also seem to have a good sense of their own limitations, so if an angel can see that a particular demon is better suited for a job, they have no problem pointing that out.