Which is better? Having more RAM or faster RAM?

Nitro-Vin

According to Dimitrios Tolios, "it depends on the application.  
  
RAM speed is very low in the list of bottlenecks you have in a system, regardless of what you are doing.  
  
If you are interested in gaming, most likely you won’t need more than 8GB of RAM. If you already have 8GB, getting more is most likely in excess, so getting a bit faster RAM will give you a performance increase, simply because more does “nothing”. Outside of numbers in absolute FPS, that has a very small real meaning, because for RAM to really matter, it means that you already have a way above average CPU and GPU.  
  
If you are doing a bit more advanced designing, photo or video editing etc, with applications that are pushing your RAM utilization to 70+ % of the available RAM, you sh should consider upgrading the capacity. With these programs, the bottleneck is again almost never the RAM speed, but the RAM capacity can be an issue and can severily hurt performance or even cause instability of the system if you start running it close to 100% RAM utilization.  
  
Once you have enough RAM for what you need, getting a faster CPU or GPU is almost always a much better investment of your money than getting faster RAM."

AshrafNsubuga

both  are better