The shared SaaS option is the most cost-effective solution, with a lower monthly cost compared to the dedicated SaaS platform. However, given the recent advances in systems virtualization, the cost difference between the two models has decreased significantly compared to the early days of SaaS.

Another factor to consider is that a shared SaaS environment has fixed upgrade timing, whether it suits the client or not, while a dedicated SaaS environment allows the client to choose the upgrade timing within a time window, usually 90 days.

Finally, most SaaS vendors impose daily processing and data-load limits on their shared environment, while the dedicated option is generally not subject to these limits.