The 12W+ emitter module has 4 LEDs. If you make them all the same color, you get the brightest blade. If you make them different colors, you get a dimmer blade but more color choices.
On my hero Gladius, I have two royal blue emitters and two red. This lets me do 6W blue, 6W red, and any purplish shade in-between up to 12W. Or if I add a photon blade, I can get 6W green (using blue light which the blade turns green). I find that blue overpowers red though, so a good purple is more like 6W red plus 2W blue, for 8W total. And my 6W blue blade looks a bit brighter to the eye than 8W purple. The different colors do not have the same visual brightness.
If you do a RGBA emitter, that means even dimmer colors, but you can turn the blade basically any color of the rainbow. The red, green, blue, and amber (yellowish) colors will be about 3W each, or can combine in pairs for about 6W. Some colors might also look good with more than two emitters activated, which should make it a bit brighter.
So, you get to choose between brightness and color flexibility.
The saber comes with 6 sound fonts pre-installed. Some are nice, others are boring. You can swap them out with fonts from a variety of sources, or make your own. It's just a bunch of .wav files. Naigon provides a Windows program for configuring the fonts and other settings
here, but I had difficulty getting it to work (it uses dotNET 4 which is super old) and found it easier to just edit the text files by hand.
While you are configuring the SD card, it's worth mentioning that you'll have to quick-format the card each time and copy the contents again from a hard drive. This is because the driver requires zero fragmentation, and that's the easiest way to ensure a clean filesystem.
I recommend reading the SC2R2 manual from Naigon's site linked above. It answers all sorts of questions about the hero-tier electronics.
Oh, and if you want hero RGBA and want it quick, order from Etsy instead of SF's main site. It should reduce the wait time from like 12 weeks down to 1 week.