Quoted:
Consider the amber dot washing out on light colored targets. Not overly common, but I've had better experience with red reticules.
Otherwise, the Trijicon is smaller, and if you're already looking at the trade, haven't you already made your mind most of the way to it?
The amber is MUCH, MUCH better in the dark than red. The only real place that the Reflex 2 suffers is when shooting indoors out onto a bright daylight area. It's functional but not as fast as a powered dot under those circumstances. Outdoors they are as bright as you could ever need them.
I'd do the trade, OP. There's something to be said for a sight that never needs to be turned on in the heat of the moment, never has dead batteries etc. Some people don't like the 12 year half life-note that is a half life, not "dead in 12 years"-but I have yet to have it be dark enough to where the tritium was illuminating the reticle and I could properly identify a target.
JMO.