Both could be considered "excellent" choices. (said with tented fingers)
There are many other brands that offer good value, etc. Quintana Roo, Felt, Cervelo, Cannondale et al.
Make sure that you are doing enough tri- or tri-training to make the purchase worth your while. The occasional sprint, for me wouldn't justify the cost and would look to just buy a good road bike to do the occasional event on. If you are going to go gang busters or are looking to focus on tri- a good tribike will be more than worthwhile.
One advantange would be the aeroshifters. Tri bikes don't climb as easily as road bikes & to have your shifting right there with just a flick of your hand makes a nice difference. On a hilly ride on my tri bike, I shift A LOT.
Plus, the radical "nose down" positioning on a tri frame apparently saves your hammies for the run.
I've only ridden tri frames, so I don't know if any of this is better than road frames, but b/c I exclusively do triathlons with a few rallies here & there, it works for me.
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