It is a lot easier to fly a G1000 IFR. By that I mean, you can keep altitude within 20 feet and heading within 1-2 degrees as the norm. No way can you do that with a G530 and conventional instruments. You have lots of redundancy, lots of useful information to make your flight safer and easier....
Each to their own of course, but once you get au-fait with the G1000 you will never want to turn back!