In the FWIW department, we do use Oetiker clamps, and have the factory tool for installation. Spring clamps are good, but note that OEM applications likely use ones that are two layers - double spring pressure. Screw clamps are fine, just don't work as well on small lines. Of course the Oetiker are single use, and the silly filter has four connections. Naturally, we use AN fittings on our race cars.

Just put the car on the lift to change the fuel filter with the OEM unit. Will see what this does.