Palacio del Inka vs JW Marriott El Convento in Cusco

We are staying in Cusco for 3 nights. We're using Marriott points so it boils down to one of these hotels.....Palacio del Inka or JW Marriott El Convento. It seems like they're very similar. It's a family of 4 with an 18 and 14 year old. Are there any small things that might make a difference to prefer one over the other. Service? Breakfast? Anything included at one and not at the other? One offer upgrades for Gold status and not the other?