Better is subjective. I have an air mattress that I fill with a pump that plugs into a car lighter port, but they sell small, light, battery operated pumps too:
https://www.amazon.com/Intex-Quick-F.../dp/B07F3DNV62
It all depends on how heavy you wanna pack and how you plan on getting to your camp site though. An air mattress is bulky and heavy, so I wouldn't wanna throw one in a backpack and trek out on foot. The last couple two three times I've gone camping I got there by vehicle.