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2nd stages are identical.
1st stages are both balanced diaphragm but of a different design.
Since what a reg "feels" like to breath is dictated by the 2nd stage, and both 1st stages are more than adequate performance wise, it really makes very little sense to get the more expensive model.
The Legend first stage is environmentally sealed. The Titan LX first stage, I believe, requires an add-on "Dry" Environmental Kit (Part #100525) to be environmentally sealed.As i understand it, isnt the Legend rated for really cold diving? The Titan is as well, but i think the legend can go even colder or something