Battery life. You mentioned 6-8 hour sets, that might be pushing the 14's battery life while the Air will keep going. I remember from my days of DJing, finding an available outlet in a club booth can sometimes be a challenge....And in all honestly, I really like the form factor of the MBA M2 (lightweight, slim, portability etc.). So it might not bother me to upgrade the ram as well - but at what point should I consider MBP M1 14"?
Any reason why you're not considering getting a less expensive M1 Air considering all the abuse laptops get under these conditions?