I experienced both of them for the first time in December (first trip back since 2015), and I have to say...FOP blew me away. ROTR was kinda cool but was mostly just one giant indoor queue with themed CMs. Like HM if each part were 3x as long and I had to wake up 2 hours early to obsessively refresh my phone and plan my day around it. There were some parts that were really neat from an effects standpoint, and seeing the AT-AT room took my breath away the first time, but it was nothing compared to flying on the Ikran. I am much more of a SW fan than Avatar, and I was really psyched for ROTR, but to me it was just ok after so much hype.