From 1984, the best recording is from Sun City. It's a soundboard recording. Kind of dry, probably a couple gens from the master, but still quite excellent.
The best audience tapes from 1984 are from Birmingham (third night), Milan (either) and Vienna (first night).
1985 has official releases from Rio and Tokyo. The best-sounding audience tape is from the Osaka show. Actually quite stunning for an audience tape of any age.
They're all available here. Search the announce section, or start here - link link
There are a dozen or so recordings worth hearing, but if you want to pick just one, weighing sound quality vs. performance, Sun City is the one to get. But it's just the first half of the show. Grab Osaka from the Masterport bootleg too.
I do like the Dynasty concert in Stuttgart. It's not the best sounding source but one of. There's a Nordico remaster available of the master tapes that were originally used for the lp bootleg. Excellent show in my opinion. I love it as I've been to this venue for a lot of other concerts (Depeche Mode, Slipknot, Machine Head, M. Knopfler) and the acoustic sound of this hall is horrible. I've never understood how such an awesome audience tape could be recorded there...
Sun City is one of my favourites! We can only wonder whether the second half is as good as the first... I certainly hope the mystery sharer returns one day:-)