Most relevant difference over UP3, in my opinion:
- UP3 has working MultiCrew in DogFight mode (albeit, limited, and, with issues), HSFX6 has none.
- UP3 has no working MultiCrew in Coop mode, HSFX6 has.
But, HSFX6 has an improved Swordfish, so... it wins!
It's been a while since I've kept up with the mods but now that 4.11.1 is out with the nice new AI I suppose I might try them again since the mods add so much eye candy to the stock game. For offline solo playing are HSFX 6 and the latest version of UP3 pretty similar? They're both compatible with 4.11.1 right? As long as I get the nice plane and ground textures, new decent plane models, and the nice new stock AI, I'd be happy. I didn't really like the first versions of UP3 because they had the crappy old stock AI.
I've downloaded it and it's very nice, I don't add anything to it so I can use it online on mod-enabled servers, not too many yet though so I still have HSFX 5. I can't really say if it's better than UP3, I have both. I also keep that install 'clean' and do all my add-ons in DBW 1.7