What do you like about the G502 specifically? I wouldn’t classify it as a “big” mouse, especially compared to Deathadders and the like. Grip width is just as, if not more important than length.
Palm, claw or fingertip grip?
That said, I’d recommend the Nixeus Revel, it’s one of the cheapest larger mice with a sensor that works well for gaming.
Very few cheapo mice are worth you time for gaming, the sensors are cheap and there are often serious firmware and reliability issues. “Convoys” of the gaming mice market there are not.