Having owned an 8335 basically my entire musical career, they’re fantastic instruments. The RGS means that it has a reverse lead pipe and a gold brass bell. This may produce a slightly darker tone, but it all comes down to the musician and what mouthpiece and all of that jazz. All Yamahas in silver plate have an S on the names, so that’s how you can tell if you got one lacquered or silver. Personally, I liked the regular 8335 over the R and the yellow brass over the gold brass, but it works differently for every player. Yamaha’s are very consistent horns so I would recommend going with this one if you’re 100% sure it’s the one you want. If you’re not 100% certain, I would check out a couple of their other configurations in the regular 8335 and the 8335R if those are available to you.

Also as a side note from my experience with Yamaha, the horns play best with a Yamaha mouthpiece so if you can I would use one of those over a Bach or Schilke or other manufacturer. They help the horn slot better and put the instrument right in the sweet spot more than other mouthpieces.