The new Amira is built to be a racy race bike. It's superstiff and would probably be great for your triathalons. That being said, I haven't ridden one in direct comparison to the Ruby.

I do have a 2010 Ruby, and it's noticeably stiffer than my '06 Ruby was, but I find it to be super comfortable. The new Ruby is supposed to be more for the long distance road stuff, with slightly less aggressive geometry, longer chainstays, and such. I commute the heck out of mine, but I don't think you *couldn't* race on it, to be sure.

All else being equal, I guess it depends on which direction you are leaning long-term!

-- gnat!