What is the best MSI generating install tool available? [closed]

I am using WIX at the moment, but keep on running into limitations (such as ability to expand properties as the value of another property). Also not sure if I ran into a bug with the FileSearch element, because it is not working as expected (does not find a file that is definitely there). I can go the route of using custom actions built into a dll, but was just wondering if there is a beter way.

I think the best tool (maturity, features, documentation, easy-of-use) is currently AdvancedInstaller. I'm not usually recommending commercial tools but this one is really good value for money.

They also have freeware edition for basic needs.