[NalNezumi]

As someone in robotics (but not Hardware side) my humble opinion is that it is the easiest(software), durable and robust one (and probably cheapest) available.

When you have two finger grippers, you have to consider how wide they can open (if it is too narrow, usability suffer, too wide the mechanical complexity increases), how many joints you have (too many make them heavy/low durability/expensive), and the torque/force you can put on the fingers (too high it crush the object, too low it slips out. Also more force you want, more expensive the gripper becomes).

On top of that, on the software side: if you use a suction pad you only need to estimate _one point_ of the object to be picked, and can also ignore the "grasping" problem all together. For other grippers you have to estimate several points (two for a simple gripper) and this increase the complexity for both detection (labeling of data, sensitive to center of mass in the object, etc) and grasping