Higan is extremely accurate, but requires a very beefy system to run. Keep that in mind if you don't want your system to go up in flames.
I guess it depends on your definition of beefy. I have a i5 8600k and a GTX 960 but higan seems to use only about 20% of CPU and 10% of GPU based on task manager. I used to run higan with a i5 2500k which was released in 2011, over 7 years ago now. But I guess not everyone has the luxury to have medium to higher end computer parts, so that's understandable.