Definitely the laptop/tablet. Knowledge is power. Need to learn how to perform an emergency amputation? It's on the internet. Need to learn how to build guns from scrap? It's on the internet. Need to learn how to grow crops with minimal resources? It's on the internet. Need to learn real military combat tactics? It's on the internet. Need to learn how to make biodiesel? It's ON the fucking internet!
It's also the only option that allows for a realistic method for rebuilding modern civilization should zeds be eliminated. All the really complicated shit like how to build refineries and nuclear power plants, how to program supercomputers, how quantum physics and rocketry works, the complete text of laws of society, etc. is also on the internet in its entirety. It also preserves all of cultural artifacts. Every book ever written, every song ever composed, all the porn ever filmed.