They do different things better. I preferred the characters of TFA and Kylo Ren was a better villain than R1's. Han's death and the lightsaber fight in the snow were also stellar moments, as was the Falcon fight and Poe's "One hell of a pilot!" moment. The start of the film also may be the best of any SW movie. There were weak moments, like on Han's cargo ship and the egregious "how are we seeing these planets explode?" shite, the final ship battle was also forgettable. Phasma wasn't handled well at all.
R1 had cool characters that were more entertaining as concepts than anything deeper, but they were strong enough that I'm legitimately bummed we can't see more of them. All the fight scenes were great. The Vader scene was spectacular. The start of the movie was rough and the Saw scenes weren't that great, though hardly bad or anything. However, it may have the greatest climax of any of the films. The finale was absolutely amazing and left me literally shaking as I left the theater.
R1 stomps easily. It's better in litterally everything and i already look forward to watching it again asap, while i couldn't care less about TFA. Not that TFA is a bad movie, if i could give it a mark i would say 6,5/10, but R1 is a solid 8, 8,5.
R1 on the other hand gave just as much Nostalgia to the OT, while actually giving us a new story, new worlds, new ships, and breaking new ground with special effects as SW always has.
R1 also didn't feel the need to force in a Lightsaber duel just for the sake of it. But most of all R1 had balls, something TFA severely lacked.
__________________ "Happiness is a lie. Life is horror. The light is always dying all across the universe. The last star will flicker out someday, when it does, all that remains is shadow. And I will be its king!"'-Amahl Farouk