Does sweating more mean a better workout?

No. Sweat reflects heat regulation, humidity, clothing, and individual physiology, not calories burned. A hot yoga class and a cold-weather run can burn similar energy with vastly different sweat.

Sweat rate depends on genetics, acclimatisation, hydration, humidity and clothing. Fitter people often sweat earlier and more, not less.

Better intensity markers: heart rate, how hard it feels on a 1-10 scale, and whether you can hold a conversation.