The GAS is better in every area other than sounds…which still aren’t bad.
The visual model of the DC Stearman isn’t very accurate, with a lot of details wrong or missing. For example, the cockpit proportions in general are a bit off and the instruments should not stick out of the panel and shouldn’t all be the same size, the clock for example should be way smaller.
When it comes to the outside model, some of the more noticeable mistakes are the missing metal panels at the tail section of the fuselage, the oversized & wrongly shaped handgrips in the lower wings, and the simplified engine model. Another issue are the fabric surfaces, in real life they are smooth with tapes (fabric stripes) over the rips, to cover the stitching. Here it looks like the fabric surfaces only consists out of tape stripes.
The GAS visual model might not be to the extremely high standard of for example BlueMesh or Carenado, but it’s a very accurate depiction with all details you’ll find on the real one depicted. Furthermore, the GAS Stearman comes with three variants, the Continental powered PT-17, the Lycoming powered PT-13 and a modernized version with a 300 hp Lycoming R-690, like they often get restored/modified by Rare Bird Aviation in Hungary.
When it comes to the flight model the original DCs one isn’t very accurate, for example the roll rate is waaaaay to high. There is however a fantastic mod by Stearmandriver making it much more accurate and a lot of fun to fly.
The GAS Stearman has individual flight models for all three variants. They are much more authentic, with a realistic roll rate, spin capability and it’ll do hammerhead turns like a champ. Like with a real Stearman you’ll run out of altitude quick when doing aerobatics. Apart from the ground handling (which is a lot tamer than a real one) it feels like a real Stearman (as far as I know, Stearmandriver was also involved in the flight model of this one).
I think the best way to test a flight model is with aerobatics, with the goal to replicate maneuvers you would see a real one doing at airshows.
Here is a video I made with the DC Stearman a few months ago, using Stearmandrivers flight model mod. As you can, with the mod it’s a lot of fun to fly and comes close to the real thing, however the roll rate is still a bit too high and it’s much harder to do hammerhead turns with it.
And here is a video with the GAS Stearman. The roll rate is much more accurate and it’ll do hammerhead turns much more precisely. Overall, it feels more authentic and you’ll be able to do more maneuvers with it.
My goal isn’t to bash DC Designs. With the flight model mod, it’s a lot of fun to fly and the engine sounds are to die for. I had a lot of fun with it. However, if you want to fly an accurate depiction of a Stearman you’ll need to fly the GAS one.