Salesforce marketing: path optimizer vs A/B testing

Question

Anyone can enlighten to elaborate the difference and when should use path optimizer against A/B testing vice versa.

Answer 1

Taken from the Path Optimizer Trailhead:

Path Optimizer goes beyond A/B testing (which uses two variables)—giving you the ability to test up to 10 paths in Journey Builder. What’s a path? It’s simply one sequence of events in a journey. Let’s take a look at what this looks like in Journey Builder.

So in essence, Path Optimizer allows up to a 10-way split between customers and A/B is 50-50.