I suspect that with an ADR 2 (+3) FAULT, you lose the Flap Auto Retraction to FLAPS 1 when reaching 215 kt.
Seeing that FLAPS 1+F has a higher speed schedule than FLAPS 2, I guess the reasoning might be that FLAPS 2 is preferred as it gives you less room for error just after T/O. It basically delays the error till later on if you wish.