After having handled many (dozens) of mostly 2nd Gens--some 1st's--over the years and in a sense had "half" ownership with a friend in some, I got my one and only Colt in 2008--a rare, new production but uncatalogued "4th" (late 3rd) Gen .44 Sp. The combo of caliber, and fact of it being a recent production was my main motivation. No regrets and it's a stellar piece. Otherwise, I'd "normally" go USFA, equal or better quality as mentioned, for less (apples-to-apples) so many more model choices, options and, historically much more prompt/responsive customer service and "customized-to-you" production. For the same street price as the Colt you can get the premium USFA Pre War with its brilliant blueing and case-hardened hammer, etc. Otherwise, the closer apples-to-apples comparison to the normal (99.9%) Colt SAA offering is USFA's. "Single Action" which can be had, street price for $100-300 less than the Colt, sometimes lucking out in having the normal add-on CCH hammer included. I should add the USFA-actually in all trims--adds the "black powder" cylinder bevel as standard. Not so the Colt--shame on them!
Take either the Colt SAA or USFA SA price and, by percentage, the depreciation should be about the same. Assuming resale in excellent 90%+ condition, the late model Colt, assuuming $1200 new, even in today's economy will not likely dip below $1,000 resale unless an emergency sale. The USFA SA, assuming $1,000 new (and can be found less with some looking), will not likely dip below $850. Same same % except less initial outlay for, arguably the same--or better gun, functionally.
I admit I was ultimately drawn by the "Pony" and reports of increased Colt quality on its newer guns--as a (likely) one-time (unless odd 2nd or 1st Gen collector gun later on) purchase, and as I say, I don't regret. Hopefully I'll be able to heirloom mine along and will be proud to do so.
So, If you've got the jingle, sure, why not? If OTOH looking for an SAA-or-better "experience" (visual and functional) for less $, I wouldn't be shy at all in getting the USFA. .
I also picked up a NOS .44 Sp Rodeo a few years ago and, as also mentioned, it's a stellar piece just as their more premium (cosmetic) models are. Not particularly enamored with the finish, I got the Rodeo specifically as a "perfect platform" for antiquing. Now I want one of their Double Eagles. It never ends!
USFAs are great guns. Don't kid yourself in the comparison. The depreciation factor's not *enough* of a difference favoring a (standard) Colt--if any--to factor in IMO.