Booking.com or easybook.com? Trust 'em?

I was going to book a hotel in Paris and over the weekend, the price went up quite a lot. I can still get the lower rate with booking.com and/or easybook.com. Are these reservation services reputable and safe? I don't want to show up at my hotel and not have a room! Thanks for your thoughts.

I'm not familiar with easytobook, but booking.com is certainly very reliable. Is it a last minute booking? You can get pretty good deals through sites like Rates To Go as well then. They power the last minute bookings here on TP for example.