I had 3 in 5 years. The youngest just turned 4 and I've just emerged, blinking, into the light. Apparently Donald Trump is President of the US. That's a turn up, eh?
I think the number of kids doesn't matter so much as their personalities. You could keep going having chilled kids but eventually you'll have the child that makes up your mind to get your tubes tied.
Logistically, 3 is much harder than 2. It's not very earth mother to think of logistics, but it's much easier to be earth mother if you don't have to. Cars, holidays, typical affordable homes, as time goes on think of swimming x 3, or soccer, drama and Katie's party all in at the same time.
My 3 kids are in a flowing tide of alliances, enmities and betrayals. That's still way better than a definite 2 and 1 dynamic.
I'm a shadow and often think I should have only had 2, but then, looking at those 3 wonderful kids how could Ipick only 2?
If you're only dithering about a third, don't do it. Unless you're mad keen, cannot ever be satisfied until you have a third, stick with two.