Puddling is easier. If you roll you have that stiffness to contend with and more fabric in the harp. Please consider how Tartan says she does hers with a ruler foot and ruler. When using a walking foot you don't have the abilities of movement that you do with the ruler foot and ruler. If you aren't comfortable doing FMQ then you certainly can do the walking foot but it will be more time consuming and will be more difficult.