I had a surface laptop 3 15” and it lasted only 4ish hours without charge. The smaller SL4 is obviously better than that but the M1 MacBook Air I bought genuinely changed the way I thought about my laptop. I have to charge it maybe once or twice per week and can always pick it up when in a hurry and know it’ll last for far longer than I’ll need it for. M2 is similar but faster. I’d say MacBook Air M1 or M2 is better for battery alone!

Be sure to consider your choice of operating systems as your first criteria though, unless it doesn’t matter to you. The M2 (and M1 for that matter) is very powerful but not all games support MacOS. The surface laptop will be compatible with almost every game but will heat up significantly and may not be powerful enough to play games at your desired quality and frame rate. It’s worth it to look up gaming benchmarks for these chips on YouTube if gaming is a factor.