I book via hotels.com to get there 8% discount (on hotels that apply), or booking when/if the hotel is on the genius 10% list. But yeah, if the hotel I want to stay in isn't on a discount on either site I'll book direct if the price is the same/less. I do travel often without a computer and need to book quickly so will just use booking or hotels app, as it's easy and quick, whereas the booking direct is usually rather hard. + I don't usually book within a hotel chain enough to gain any rewards, which you do on hotels.