I have them both. What bugs me about Suitcase Fusion (12.1.7) is the inability to move sets that have painstakingly been created from one computer to another or from one login user to another. On a network, Suitcase offers a much more expensive solution that can keep track of sets by storing all fonts in a centralized repository accessed by all computers.
For the average user though, virtually anything that can be done with Suitcase Fusion can be done in Linotype FontExplorer X. And in some cases the later is even more advanced. For example, on a computer with multiple users, you can view which fonts are active for each user. You can also create an account and purchase Linotype fonts from within the application. Both utilities support auto font activation for major graphics programs.
Download FontExplorer and test it out. If you think you need more, pay for Fusion.