I don't really mind the brass, it's just that I wasn't too fond of the Enigma's well, It's the same size as the patriot, which isn't bad, but in comparison to the Tugboat's which is the same size as the Omega without the airholes being on the well, you have more juice/ cotton for use.
At the same time, I assume due to the gold plating the Enigma would hit harder, but since it's gold plated, it would also wear down and the hit would fade with usage, speaking of the bottom connection, not of the positive post.
The Tugboat uses stainless steel connection, but it still hits harder despite the build, and despite the Castle having a copper connect, ect. ect. Functionality wise, I do prefer the Tugboat, plus the driptip it comes with is delrin insulated.
In the end, it comes down to which you prefer, and which style is your preference. I've no doubt the Enigma will hit harder due to the gold, but as that fades, you will notice as well. The Tugboat may hit less, but the drip well makes up for it, along with the postholes being bigger, imho.