I own them both and personally I prefer the MB339 but quite a margin. Both are equally well modelled but the 339 is just nicer looking plane in my opinion. I love the retro feel of it and as others have mentioned its really well optimised in the sim. Its great for fast jet VR flying.
I certainly wouldn’t get the Goshawk now that the Justflight Hawk T1 is just around the corner. Its looking incredible.