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The fram extended guard is sturdyer. Thicker can, designed for long drains.
I didn't know the thickness of the can had anything to do with the recommended OCI of the filter. I thought it had to do with burst strength. That said, I've never had an issue with any oil filter bursting, rupturing or becoming misshapened due to filter pressure. I suppose it could be an issue in a racing application, not likely a significant difference in standard vehicle application.
IMO, and according to Puro, the P1 can easily handle a 10k OCI. Fram touts the same for the Xtended Guard. Price, P1 ~$4.75 at Amazon $5-6 elsewhere vs ~ $8 for the Xtended Guard. With P1's 99.9% efficiency, XG's not worth the price premium to me.
The Motorcraft FL-820 S is also a sturdy well made filter, and a great value at ~$3.64, but it's only rated 80% efficient. I must say though, having cut one open that would seem to be a lowball figure.