8200H and 8300H are essentially the same receptacle, both are hospital grade. The only difference is the 8200H has a 15A faceplate, the 8300H has a 20A faceplate.
The "H" designates that it is a small bodied receptacle, with no nickel plating, make sure to get the "H" series. The "regular" 8200I (no "H"), for example, will be nickel plated. They come in a variety of colors, 8300HI for ivory, 8300HW for white, etc.
Nickel plating is a tough cookie, I think the only receptacle I've heard that I like that utilized nickel is a cryo'd PS Audio. So, if not getting a PS Audio, you might want to stay away from the nickel plated models. Strictly IMO, FWIW, IME, and for good measure ETC, ABC, 123, AC3, DTS.

5262 is a 15A "industrial" receptacle. 5362 is a the 20A version. Both are built very well; nice and beefy. They are huge! No nickel plating on the contacts.
As to which is "better", they both are good, IMO. Hubbell's have a very full mid-bass (some say too much) presentation and tend to be very smooth sounding, IME.
Don't forget to take a look at some of the other "audio grade" offerings, for just a bit more $$, from Furutech, PS Audio, Acme, etc...
Disclaimer--I sell Hubbell 8300H's (well at least until I run out, I am not going to re-stock them...) and Furutech. I do not offer Acme or PS Audio at this time.
Peace,
Lee
I'm going to get some [up to 10], of these hubbell's. I'm looking at 5262, 8200H, and 8300H. The H standing for no nickel plating. Which is best, 2nd best?