For me, McQuarrie and Simon is the best general physical chemistry textbook available. It's not particularly beautiful to look at, and it's a bit math heavy for what most undergrads would prefer, but I've always liked its molecular approach to the topic. Atkins and de Paula has better diagrams and is probably less intimidating, and is also probably more widely used right now. It also covers a lot more ancillary topics that you might be interested in.
(As a sort of side-bar, Julio de Paula was one of my undergraduate chemistry professors, so I know well the way he teaches. He wasn't an author of the textbook yet at the time I took his class, though. And as another side bar, Peter Atkins is something of an amateur philosopher and a prolific popular science writer, although his views have stirred controversy because he is a secular humanist with a pension for rabidly criticising religion. Even so, some of his books are worth a read if you're into popular science, science philosophy, the nature of the universe, that kind of thing.)