The performance on and off battery is amazing, no difference on battery or power.
its an amazing machine but has not been without its problems. I heard the new M1 Pro 16" had a great screen, good battery life, was very fast and performance was amazing so it got it. The battery lasted 2 hours tops, the screen was good but not amazing and it was loud and ran hot and off battery the performance was so bad. It had so many problems (4 months to fix the motherboard and screen) and after 2 years I gave up on it. My windows laptop was not great, a Gigabyte Aero 17". I work for myself and mostly develop websites but its not limited to node, mobile apps, python, perl etc. Last year towards the end of the year I bought a new MacBook Pro M1 16" with 1TB SSD and 16GB RAM.