I've used generic and brand on the Pfaffs. I've even had Elna feet with attached ankles work.
Since I got the PQ1500, I use that. I found that the normal foot is close to scant, so I marked it the same as 1/4" and use it when pattern says scant. I do have generic high shank feet. I will use a generic open toe rather than stitch in the ditch foot to see where I am going. Did the same on the Pfaff. Mine's a 9mm machine, but I bought the 6mm open toe as it works better. I don't care much for the 1/4 inch foot that came with the machine. I'm used to Pfaff. Those are narrow on both sides. You can turn the fabric and use the left side of the foot.