I have used both Perfect Finish Sealant and S0.02. Actually, I won the bottle of S0.02 and was sent a bottle of PFS to test.
S0.02 - This is a polymer spray sealant, which means it's super easy to apply. I actually really like it because of the high gloss and slickness, and the ease of application. In comparison to some spray sealants, you really don't need to put much effort into the wipe on/off, it flashes off to a streak free finish. From what I understand, the longevity isn't exceptional, but in my opinion, the ease of application balances the equation. For example, it can be used on a near-dry surface after a wash, almost like a drying aid-type of application. Naturally, don't use it all the time like that, rather it shows how flexible S0.02.
On this Range Rover, the paint was HAMMERED! Full of swirls created by car wash brooms. I gave the car a decon wash, then blew it down and applied S0.02. The gloss, slickness and saturation hides how trashed the paint is. All from a spray and wipe product.
Having won the bottle, I had nothing to loose................but I would absolutely buy it again.
Perfect Finish Sealant - This is much more modern sealant, if a little unconventional in the modern era. It doesn't atomize, so technically it's not a spray sealant. Instead, its more of a lotion that is applied with foam/microfiber applicator, or even a D/A machine. This would be the same way you'd apply a traditional liquid wax or sealant, which I don't really like it for that reason. Actually, that type of application is probably why PFS lasts longer as you are laying down something more substantial than a simply spray and wipe product. I've put it on a customers car that sits outdoors 24/7 and have been extremely impressed how long it hung in there.
The other thing I noticed was how it filled minor defects. The badge on this Subaru was jacked up, well PFS completely hid the swirls on the badge, and the rest of the car too. It also brought out the metallic, which can be hard to highlight on white paint.
The real question here is if you want a spray sealant or a liquid sealant. I prefer S0.02 because it's easier to apply and has a warmer level of gloss, something that comes back to its older polymer formulation. New isn't always immediately better.