The main difference between Wi-Fi and 5G lies in their use: 5G is a cellular mobile connection for outdoors and on the move, while Wi-Fi is a wireless local area network for indoors and connections to the internet or between nearby devices.

5G offers theoretical speeds of up to 10 Gbit/s (actual speeds are often 300-800 Mbit/s), ideal for mobility, but consumes more energy and depends on antennas.
Wi-Fi (mainly 5 GHz or 6) is more stable in homes with fibre, offering speeds >1 Gbit/s, low latency for games/visio, and local connections (printer, TV), with less energy.

These technologies are complementary: use 5G on the move and Wi-Fi at home for better performance on your tablet.