5GHz performance is vastly better in urban areas. There are 26 networks visible from my apartment (in a small 2-story apartment building), and the 2.4GHz WiFi spectrum effectively has only 3 channels (due to substantial overlap, only channels 1, 6, and 11 are normally used). So you're sharing a lot of bandwidth with your neighbors. 5GHz has much better spacing (so less interference) and more total bandwidth.

5GHz also attenuates significantly through walls, so even if your neighbour is on the same channel you won't be getting as much interference.

I find 5Ghz to be more reliable - perhaps because it is not as congested as 2.4

"Nobody goes there anymore, it's too busy!"

- Yogi Berra

Thanks for making me smile in the morning