A few years ago I used to fly the PMDG 737 in FSX , but according to IXEG videos I can say that IXEG has better immersion in it; all the "small" things , like the way that the cockpit lights fade in and out gradually , and not suddenly , and many more things like this which makes the IXEG superior , and that's just when watching the videos many times to notice every little part. But that's doesn't mean that IXEG as developers are better than PMDG (or vice versa...) , let's not forget that PMDG are working with dated 32bit platform. However , if you compare IXEG733 VS PMDG737 (again , even though the first isn't released , but the videos they posted shows almost everything you need to know to compare) , IMO IXEG is more impressive in every aspect. To actually compare IXEG VS PMDG as developers , we'll need to see what level can PMDG achieve in Xplane , but honestly , I just don't care.... both are great , both will give Xplane great airliners in the near and far future. A few months ago , all the FSX guys said there is no PMDG quality in Xplane , now we have 3 like those (including LES IMO) , while PMDG are "the true path" in the FSX/P3D world.