In general, I only buy a new controller if I needed an additional one or for additional features (mainly turbo button on 8/16bit consoles). The one exception to this was when one of my joycons stopped working correctly, probably due to water intrusion (it got wet when hiking and falling into a riverbed). Thankfully only one joycon was affected in the end and the console just fine, but since they sold as a set I got two new ones anyway.
The Nintendo eShop rating Thread: http://gamrconnect.vgchartz.com/thread.php?id=237454 List as Google Doc: https://docs.google.com/spreadsheets/d/1aW2hXQT1TheElVS7z-F3pP-7nbqdrDqWNTxl6JoJWBY/edit?usp=sharing
The Steam/GOG key gifting thread: https://gamrconnect.vgchartz.com/thread/242024/the-steamgog-key-gifting-thread/1/
Free Pc Games thread: https://gamrconnect.vgchartz.com/thread/248138/free-pc-games/1/
