Is Demi Lovato a Good Singer?

I personally think Demi is amazing, but is she better than Miley, to you? I think she is prettier, cooler, nicer, funnier, a better singer, song writer, actress, and performer than Miley! I like Selena and Demi's vlogs cuz they are hilarious! Better than the Miley and Mandy Show! I just don't like Miley!