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Supposedly DI is slightly more accurate and piston is more reliable. Realistically, the difference either way is negligible for 99.9% of shooters. Only if you need to use your gun after immersion in water or dragging it through the mud is the piston likely to make a real difference in reliability, and only if you're shooting ultra-precise long-range competition is the theoretical accuracy difference of a DI going to matter.
Realistically, piston actions keep the bolt assembly cooler so you're less likely to burn yourself on it if you shoot a lot, but pistons weigh a few ounces more and cost significantly more.
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