User blog comment:GellyPop/Diep.io Comparisons Part 1: Auto Trapper vs. Gunner Trapper/@comment-32548354-20170711184908

Both are equally good (depending on who you are). The auto trapper is easier to use, because the auto turret is automatically controlled, but the gunner trapper is more powerful in the sense that the cannons have high penetration. The auto trapper is more supportive because of it's high trap layer rate, but the gunner trapper is for PvP. However, as the saying goes, "offense is the best defence", so for a skilled player, the gunner trapper is better. If you're a noob, use auto trapper!