The early ones have less entrants but smaller payouts of course. The early ones are typically about 50 entrants but but the evening ones can easily last 10 hours with 400 + signing up some times.
But I think if you want to play tournaments it’s the best value for your money. Fields are smaller, prizes are smaller, but its hours not days.
The last time we went to WSOP I only played the daily’s. Decent cashes and could still go do other stuff.