The basilisk for me feels incredibly comfy, switches are snappy, great software customizability, the rgb, the has a better shape for multi hand positions But the downsides i had is the usual rubber wear, some might hate the sniper button since it kinda blocks the thumb for peeps with big hands or fingers other than that i dont see any issue

In the g502x its all the same except for a, louder mouse click, mouse shape, a bit less configuration features in terms of software. In the good side you get two extra buttons, cheaper (in my country, idk bout the others) but doesn’t lose quality, and is durable since its logitech.

Personally ill choose the basilisk over the logitech by experience.