In terms of sharpness and resolving detail, side by side, the Canon T2i is way ahead of the Nikon D90. Shooting snowboarding would take effort with either camera since you would need to over-expose to a certain degree to get the snow a genuine white colour along with proper exposure of the the snowboarder. Travel photos will be "warmer" in colour with the D90 out of the camera, but with adjustments and/or postprocessing the T2i would be able to produce similar colour.
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