In what areas do SaaS applications work best? If I have my own startup marketplace is this a good option?

If you think that SaaS applications are a highly specialized technology, as for me, it is the most popular technology for working with clients and it is used by a lot of services in order to give more opportunities for interaction with customers.  But if you are interested in examples, then your solution is top saas startups . Look at these startups and I'm sure you'll see that all the goals are achievable

SaaS applications are great for when the application itself provides a service to your customer, then it will be a great option