Personally, I try to have a consistent quarter inch seam, give or take a little, and I use the 1/4" foot with the metal side, which keeps my seams consistent. I believe Mary Ellen Hopkins called that our "personal private measurement" or something like that. I do know that when making a quilt, use the same machine throughout. Many years ago, I was making a Storm at Sea quilt for our Holiday Fair raffle quilt. A friend offered to do one part of the block, and of course, our 1/4" seams were slightly different, so I had to make some adjustments when piecing the blocks, however, it was a small difference, the quilt was beautiful, a member of the church hand quilted it, and we made quite a bit of money from the raffle.
I've also used painter's tape or masking tape, stacked together so the fabric would not move so much, which improved my 1/4" seams.