The number "R" in a curved monitor's description refers to the radius of the curve of the screen. A 1800R curve has a more subtle curve, while a 3000R curve has a more pronounced curve. A 1800R curved monitor has a more subtle curve, which can make it feel less immersive than a 3000R curved monitor. However, the subtle curve can make it easier to use for activities that involve a lot of reading or typing, as it can be less distracting. On the other hand, a 3000R curved monitor has a more pronounced curve, which can provide a more immersive viewing experience and make it easier to view the entire screen without having to move your head or eyes. This can be particularly useful for gaming or watching movies. It ultimately comes down to personal preference and the specific use case. For example, if you're mostly working on documents and spreadsheets, a 1800R may be more appropriate, while if you're mostly gaming or watching movies, a 3000R may be better.