[KrazyCarl92]

A floor loader can:
Pick up pieces opponent's robot's drop
Pick up pieces from feeder/HP (have them drop it on the floor in the lane)
Pick up pieces that an alliance feeder/ferry bot bring back and drop in the alliance zone
Pick up pieces that are thrown onto the field

A feeder loader can:
Pick up pieces from the height of the feeder slot

Who has the upper hand?

I'll tell u that if I'm in a match against an alliance with no floor loading capabilities and our alliance can, we will definitely be chucking all of the pieces onto the floor regardless b/c we could get them and the other alliance could not.