I haven’t bought the T-45 yet, but will this weekend. The MB-339 is a benchmark aircraft for MSFS as far as detailed jets go. I downloaded the latest update yesterday, but it came out while I was flying and just happened to check ORBX Central thinking it may have been Monday morning in the UK or especially Australia depending on what ORBX office deals with that and sure enough it was there along with a 1.1 update to the (Excellent!!!) FSim Studios, CYVR. I was really tempted to fire the sim back up and try both, but needed to adult today so I didn’t stay up late flying. Point being, TLDR, I haven’t tried the very latest MB-339. The MB-339 is fun, fast compared to GA aircraft, maneuverable without being twitchy. Visibility is outstanding if you love sight seeing as you fly. The G.91 is also lovely, a bit faster, little more responsive I think, but not as good visibility. Also, consider the F-15! That one may have started a little rough, but the kinks are worked out, there’s a community team working hard on the realism of the flight model and other bits, and their work often gets picked up by the dev when it fits his vision of the jet, fun over accuracy, but still accurate where it makes sense. The model/textures aren’t as polished as the two Italians I’ve mentioned, but the F-15 still looks pretty great unless you go looking up at rivet inspection closeness. The thrust, mach 2+ speed is a thrill. Great to have a handful of fun military jets to choose from at this point.
But you can’t go wrong with either the MB-339, or T-45. IndiaFoxtEcho makes top notch products! The MB-339 is certainly a favorite of mine! It’s a joy to fly. I look forward to trying the T-45 soon!