They are both nice.
For what it's worth, I've always been a fan of the Mavic Ellipse as a daily training and weekly racing wheelset. I've used Conti Supersonics and pumped them up to 140PSI on Ellipse for a great setup. From my armchair-physicist point of view, they are pretty aero for training wheels. You'd have to get wheels like the Zipp 404 to get more aero. They aren't light, though.
The Reynolds are probably lighter than the Mavics. I haven't seen much need for carbon clincher training wheels on the track. Plus, I'd imagine that the max tire pressure isn't that high on them.
Maybe keep the Mavics, sell the Reynolds, take the funds from the sale and use that towards a race wheelset or other gear you may want/need.
Originally Posted by gtrob
Roadies can run tempo all year as that's what humans were designed for. If you want to be a cheetah, lay around and lick your paws more.