Chuck wrote great songs and did witty lyrics, but his voice was nowhere near Elvis' (nor needed it to be). The older I get, the more I like the velvety warmth in Elvis' voice which wasn't strictly rock but encompassed so much more, gospel, country, old-fashioned crooning. Elvis wasn't a songwriter nor did he aspire to be one, but he certainly had a knack for choosing the right material to make it his own.
Like many, I used to mock him (largely based on his later Las Vegas or Hawaii shows though these are not musically without merit either), but these days I accept that he was one of a kind. In Graceland, I read a comment along the lines of that Elvis' secret was that he was dangerous enough to be an attraction for white youth, but not too dangerous to really shake the tree of their parents. And really: no white guy sang like him before he hit the airwaves.
And, hey, he was - along with Little Richard - an early inspiration to a certain Brit ...