https://i.reddit.com is a good balance between app and the desktop website. A lot faster than m.reddit.com and supports the basic features of reading comments, commenting, and submitting. It also doesn't crash all the time and saves data.
Do you use the first-party app? It's probably the worst option out there.
Boost is great on Android.
Narwhal on iOS is pretty great. First-party reddit app is quite bad. Ironically reddit heavily pushes their official mobile app if you visit on mobile Safari.