So back in late 2017, Rise of the Dragon came out on GOG.
It is using a speed of 3000 cycles which is slower than the 7000 cycles that the Sierra installer uses ( http://www.sierrahelp.com/Patches-Updates/NewSierraInstallers.html#RotD ). So using the GOG version is literally more than half as slow, especially in loading times.
So right now I'm not sure which version I should allow, as one is directly from Sierra (you just need the DOS game files from the actual DOS version or take them from the GOG version I guess), and the other (GOG) is currently the best way to actually buy and play the game right now.
I would say, it's up to you, but just make sure you specify which version you are using, because I might just make separate categories for each release.
So I made separate categories because each installer runs the game at a different speed.
The Sierra installer will continue to be supported until the download link on Sierra's website no longer works.
I have a feeling the GOG installer will be good for a very long time.