The PC port is a great version to play with. Though Windows 9x version is a beta port from PS1 version, it actually surpasses from the original PS1 version.
The graphics got improved a little bit but the loading times(which were way too long in PS1 version)got shortened from original PS1 version thanks to HDD installation system.
Taking a good comparison from original arcade version, only single play system is critical cons in this version. But you can select the stage freely(and you can select same stages for 3 times!) from the first time and you can choose the hidden high level spaceship;WR-03! and if you managed to reach the true ending wth all 3 ships, the two R-GRAY ships from previous series awaits you as cameo. and they are little bit hard to maneuvering but they are really powerful and attractive!
The difficulty of game became easy to access so that everyone would enjoy well. The encroachment system got improved as well; while under 25% could reach the true ending in arcade version, now you can access the true ending even until 99% in this version!
You can enjoy the special mode which were never existed in original arcade and the gameplay is very special and unique from arcade mode!
Anyway many retro & SHMUPs gamers usually prefer the previous 2 series of RAY series,(but it is obvious that RayForce/Layer Section and RayStorm/Layer Section 2 are the one of the greatest masterpiece in SHMUPs.) I think RayCrisis: Series Termination is also a great masterpiece in SHMUPs too! so please GOG!!!