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button tells you how much energy reserve you have left.
Prefer it as its newer, more robust (though I haven't clobbered it against anything so far) and with my skx I had it serviced by seiko several times and it kept not working, so finally lost faith in it. Am going to buy a new movement for it and get alsal to replace it, as it's on a lovely @Murt13 strap but I'll never wear it full time and or trust it not to fall over and stop working in the future...
What's the button for corny? And why do you prefer that to the skx?