SSD

Intel

Noteworthy differences between the 3700 and 3500 series, and a nod to the 710:

Both the 3500 and 3700 have capacitor-backed write cache, so power events are unlikely to be cataclysmic, but the 3700 series has roughly 42x better write endurance than the 3500.

Intel publishes that the 80GB 3500 is good for 45 TB (same as the 3510). By contrast, they publish that the 100GB 3700 is good for 1874 TB. This is apparently due to a suite of technologies called HET, which includes differences in both silicon and the controller. The older 710 series share this HET technology (and share capacitor-backed write cache), but the 710 drive I/O is slower, ergo, so is the cost, possibly making the 710 a better value in terms of pursuing marginally higher reliability.

Neither the 3510, nor the 710 have what Intel calls End-to-End Data Protection, which just appears to be parity on steroids. Opinions welcome on this, but I would be surprised if the the susceptibility to bit rot on an datacenter-grade SSD did not already far exceed that of a CF card. As such, the 710 seems like it may be an affordable little corner in the realm of SSD drive overkill for a pfSense install.