I haven't made a GFG but I did try english paper piecing and had major problems. It was on a BOM and I still having redone it. I think I would try the stamp and hand piece. It sounds quicker and less trouble than the others. Jenny Beyers hand pieces all her quilts. It would seem accuate because you have marked your sewing line. You sew right sides together so you see the line.
All the quilts that have been shown are beautiful. I may have to try one.