Like any other kind of review, you have to take what you can get, and it's difficult to find one source or person who is right for you most of the time. I would look at Amazon reviews and skim for translation notes - "the prose was difficult" or "the dialogue was too colloquial," that sort of thing.
But really the best thing is to decide for yourself. Go to the book store, pick up a couple translations (used book stores usually have quite a few for classics), and read the same five or six paragraphs in each. If there's one you like better, just go for it. Worry about accuracy and scholarly opinion later - your goal should be to read and enjoy the book. If something seems weird later... try the other translation! You should feel no pressure to do one over the other for your first run through.
Thanks. I'm reminded of the comments by Borges translator, Norman Thomas Di Giovanni, on his dispute with the estate. The shared history between Borges & Giovanni undoubtedly influenced his translations, which are now only available as used books, http://www.digiovanni.co.uk/borges.htm
Oh, how interesting, I had no idea. I've been reading Hurley's Borges this whole time (which I understand now is good but not great). Time to order this... thanks for the tip.