I had a loaded and still have a TRP. They are pretty much the exact same gun except for these three features that are added to the Loaded to make a TRP: night sights, FS checkering, & magwell. You do pay a pretty steep premium for those features. But if those features are what you must have, then the TRP is a reasonable choice.... except that at the TRP price, I'd be looking at a low end Baer or perhaps a used Wilson or Brown instead.
For the most part, there is little, if any, difference in fitting and parts quality. They're both "loaded" with cheap grade MIM parts. The TRP is available in a black spray n bake polymer coating as well as stainless. The TRP is said to have a "match grade" barrel, which in reality doesn't amount to much, if any difference at all. They're overall nice guns, but I think the Loaded is a much better "value" than the TRP. Either one can be much improved by swapping out the fire control parts for premium grade parts, like the C&S tool steel hammer/sear/spring kit for starters. I don't think ambi safeties are a good feature for most people, so I'd swap that out for a good premium grade, minimal profile single sided thumb safety. Pop in a premium grade slide stop too while you're at it. I like the coarse FS checkering on the TRP, but magwells are not really an important feature for most people. This is why I give the nod to the Loaded, then do some custom upgrades to premium parts. But by the time you spend the time and money to upgrade the parts, you probably would be better off having bought a low end Baer which will hold it's known features/quality and price much better than a tweaked Springfield. For the approximate price of the TRP, especially after upgrading the cheap parts, there are MUCH better guns out there.