I will bet your list of preferred versions will continue to change over time
Quite possibly! That said, sometimes they say your first version remains 'stuck in your head' as 'references'. After 9 different piano versions (and 3 different instrumentation versions) of Bach Goldberg Variations...i still come back to the first i ever heard...Glenn Gould '83 (i also own: Roslyn Tureck, Gavrilov, Dinnerstein, Ito Ema, Gould '51, Leonhardt, Schiff and Rosen, as well as Sitovesky, Loussier, Maisky which are totally different instrumentation)
In my case i have had a few instances where i 'never got' a piece of music based on a recommended version...but after listening to a bunch, when i found 'one' i liked, it sticks with me for a long time. In the case of Barbirolli Mahler 5th...i have no desire to look elsewhere. But after all the Penguin Guide version of the other symphonies (and i like Penguin quite often)...i was surprised not to 'get' Mahler's other work.
I really now dig Mahler across the board, and the ones in my 'ranked' post are the ones that helped me really get into Mahler very very easily. All for now...as you say, we shall see!