There's little in it. The Trek appears to have a wider gear range. Both are fine for the TPT, which is mostly surfaced, I think. My preference is for the Giant, as I like the older bikes. Trek could be lighter. Keep the one which fits you best, or, the one with the least wear on the drive-train, or the one with the best resale value which is probably the Trek.
Last edited by snafu21; 06-10-10 at 12:51 AM.