It's not even close on a global scale.
Queen's easily more popular.
In the UK for example, Queen have been on the album charts for more weeks than anyone...including the Beatles! They also have a large advantage in worldwide sales. KISS might have greater popularity in the US, but in Europe Queen really just destroy pretty much any artist not called the beatles, ABBA or Madonna. They kill them in Asia and South America as well.
Queen also have a couple of periods of time when they were the biggest band in the world (around 1980, and the year or so after Live Aid)...KISS have never, IMO been the biggest band in the world.
And live both were brilliant, but I'd give the edge to Queen for much better musicianship and simply Freddie Mercury's unmatched ability to control a massive audience. KISS relied too much on gimmicks. It's pretty close though, but I'd just say that Queen on a good night were better than KISS on a good night (I have quite a few bootlegs of both)...particularly to the massive audiences (70K+).