Lobber is the worst shot according to Magicat's Community while Chaser is the worst shot according to my thoughts.

Which was harder? It depends, Lobber is harder on the heart while Chaser is harder on the brain, but if I had to choose, Chaser, mainly because you have to deal with Phases 2 and 3 longer with Chaser than with Lobber even if you can just focus on dodging in Phase 3 if you use Chaser whereas with Lobber you have to focus on dodging and damage.