I believe the amount of RAM can help performance of a phone 2 or 3 years down the line when the latest iOS starts bogging down performance. Case in point, my iPhone 6 with 1GB runs like crap when compared to a iPhone 6s with 2GB, both on iOS12. Granted the 6s has a faster processor than the 6, but I'm pretty sure lack of RAM is the culprit for most of stuttering and lag I experience on the 6. Please correct me if I'm wrong. Assuming I'm on the right track.... say 3 years from now, iOS15 comes out and it no doubt will use more system resources... will the Xr performance be noticeably worse than the Xs because of the 1GB less ram? Or since the Xr has less pixels to push, will it still keep up with the Xs? Can someone with a good grasp of graphics and resource handling in iOS help me come to a somewhat objective answer? This will help me decide between the Xr and Xs.