Reddit user u/ZeMastor put together this website comparing the various abridgments (that page includes spoilers, but he also put together this spoiler-free page). The bottom line is that the best widely available abridgement is by Lowell Blair and published by Bantam.

However, if you're willing to read the unabridged version (which I'd highly recommend), the gold standard is the Robin Buss translation published by Penguin.