First, it is a great thing you learned on an ATC. I think it best teaches proper belay techniques. With that, learning a grigri is incredibly valuable. It is certainly a safer device. It also enables top down belaying (very helpful on a multi pitch) while preserving the ability to lower if needed. Also, if you are ever belaying someone who is projecting, it is very nice having a device that will lock for you so you do not need to continually hold the rope tight if your climber is just hanging (still do not let go of the brake hand or tie a catastrophe knot if your climber is must let go). As for other belay devices, you can consider the Petzl Neox or Edelrid Pinch. Those would be alternatives to the grigri. I think grigri is best and most universal though. The only other belay method I would recommend is learning the munter hitch on an HMS carabiner. Personally, the munter is my preferred top down belay method on easier terrain with no new gear needed ā just rope knowledge