If you’re going to ride much on the road, get the Strada. It works really nicely, point it very slightly left and slightly down and you get lots of light where you need it and minimise dazzle to oncoming drivers and it works okay off road too.
For pure off road use the Race makes sense, but for more than occasional road riding, pointing floody beams down is a pain in the backside, particularly given Exposure’s QR mount and you end up with a light that’s mostly too close in for quick-ish road use.
The remote with the Strada which lets you dim the light without taking your hands off the bars is a nice touch too. It’s got one very narrow Joystick-type spot and a wide, flat beam btw.
I’ve only used the Strada, not the Race, but I’ve got a few off road lights and they’re all a bit too floody for road use, not so much for you, but for other traffic. If you don’t really intend to ride much or fast on the road, I guess that’s probably not an issue for you, but for road riding, the Strada works really well while still being decent enough off road as well.
Have a look at Exposure’s own light comparison page for some beam shots btw.