Ive got a Super Brace fork brace right now. When I purchased it, there was no Motorcycle Larry brace out. If I were in the market today, I wouldn’t hesitate to buy a MCL brace. Pick which ever one gives you a warm fuzzy and run with it.
Now on to part two of your question, the difference between a fork brace and a steering damper. It’s quite simple really. A fork brace prevents flexing of the fork tubes. This can cause the front end to not feel as planted in some turns, and according to some can be felt at both low speeds and high speeds. A steering damper is designed to help prevent tank slappers. Tanks slappers occur when the front end of the bike becomes light and causes the bars to shake uncontrollably. Contrary to popular belief (OK, just some people) this is NOT a problem with this bike. The FJR is a heavy bike and because of this will probably not suffer from a tank slapper. This device is usually on sportbikes which have very short wheel bases and are quite light, and dirtbikes which are even ligher and are running around in stuff trying to move the front wheel around.