In general, a good chrome shop will give you a much better product than the repo's. Re-chroming involves removing the old chrome, then adding 3 different metals, including chrome, and polishing after each step. Most repo's cut corners and only provide 2 - or sometimes a single - plating process that are usually thinner. The repo's will very definitely rust through long before a good re-chrome.
So it really comes down to whether you think it's worth paying a little more for a more durable part...plus, I have not been impressed with the repo part fit during my TR3 restoration. The originals came off, so you always know they will go back on. That's a big plus!
John