Based on most of your jacket being brown I would keep the black Hercules. With the black Herc you will have a different look and IMO black works better for formal settings. I do have Aero's version of this jacket in mid-weight black Italian Horsehide.
I still think I like the brown one better. It seems to change color, taking on almost a reddish look in different light. It is much stiffer than the black and needs to be broken in, to soften it up. The grain just pops already, and is just beautiful.
Thanks for all the input from everyone, this has been a fun conversation. After spending a really quality day at the beach with the black one, wearing it into the cool night time doing some great star gazing, I decided to pass it along.
I ended up breaking even on it, which is nice, and it went to someone who I think is really going to enjoy wearing this beauty. Hard to let go of it, but I just have too many jackets to handle.
Here is some photos of the farewell wear: It will give me pleasure if the owner enjoys this jacket and posts some pice.