The number of teeth on a saw blade is one of the things that determines how well the blade will cut. More teeth usually means a smoother cut, but there are other factors to consider as well. The size of the teeth, the kerf (the width of the blade), and the gullet (the space between the teeth) all play a role in how well a saw blade will work.
In general, more teeth means a better cut, but there are trade-offs. Blades with more teeth take longer to make cuts, so they're not always ideal for use in high-speed applications. They also tend to be more expensive than blades with fewer teeth.
There's no definitive answer to whether more teeth is better or not. It depends on what you're looking for in a saw blade and what type of cutting you'll be doing. If you need a smooth finish and are willing to sacrifice speed, then a higher tooth count is probably your best bet. But if you're looking for quick cuts and don't mind sacrificing some quality, then fewer teeth may be the way to go.