This is a good question .... the more patterns the better. I suspect a lot of us here have heard or have seen Super Mario aka Million Moves Mario at a salsa congress. He seems to have a lot of patterns and he can mix it up really really well and thus his celebrity status
Of course, the ultimate ideal is to know a whole bunch of steps and to know them well. But, when you are learning them, it is better to focus on doing the steps well and less important to learn more steps. Quality is much more important than quantity.