Go with
SCXE 2.5, because it's built right onto StarEdit (but unlocks all the good stuff!). From what I've heard people say, it's stabler than SCXE 2.6 as well.
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Very true, it is WAY more stable, and more user-friendly. Althought 2.6 does have a couple good new features.
Wing-of-no-Wing, I think StarEdit is one of the worst map editors compared to the updated editors we can use today. It's the most stable yes, but HIGHLY restricted. It doesn't come with lots of useful AI scripts, you can't place things EVERYWHERE you want, no square terrain, and there are no "X-tra's" as in Zerg Eggs, Cocoons, Scanner Sweeps, or Sprites.