Grip

Left-hand-low... seems like it would be best for STRAIGHT LINE PUTTING

Conventional grip... seems like it would be best for ARC PUTTING

Claw, Paintbrush, etc.... not sure, maybe either

What do you think?
I use a claw type grip and find arc works best. I hold it almost like a pencil w/ the right hand and just draw a straight line.
I use left hand low and arc putt. The left arm works like a swinging door.