I have fairly limited experience with the OPS Core, but I own the Airframe. The Airframe was more comfortable in my size (through I prefer the Team Wendy padding spam solution of holding it in place), and critically for me in this desert climate (since this gets used as much as a two-wheel helmet as anything else, though it is my primary NOD hanger ) it was cooler to wear.
The sticker kits will move over with some creativit, I'd get the plastic rails just because they're useful (mine sans helmet rails ends up being odd looking, but the only accessory I would consider running on them is a PTec Switch for now anyway).
Between the two the padding is what makes the Airframe a worthwhile helmet, the other tradeoff is the basic size (the front half is basically like having an inch thick over the top headset on that will catch on things in tight overhead spaces). For me that added bulk isn't a major loss for the bonus cooling, especially since I drag helmets across all sorts of things (and this is one of two helmets I own which I haven't destroyed - I truly have a gift for wrecking helmets), but that was the most prominent difference between them to me. The OCC-Dial setup actually worked really well for me, but once I got the padding arrangement dialed the airframe ran how I wanted it was a wash. I would agree that the OPS-Core was better as a pure NOD platform, but coming from a USMC LWH, anything aftermarket was basically fabulous, so I chose based just on that magical cooling factor. Finally, if you find yourself wanting to run goggles wrapped around over to the back, the odd shaped step isn't as helpful as one would think; but running a mesh cover, the trap straps, or the protec-addon keepers for that solves that issue.
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Semper Fi
"Being able to do the basics, on demand, takes practice. " - Sinister
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