I’d say nothing beats Photodex Gold for quickly and easily slapping together a montage of photographs in a hurry. I can also tell you nothing beats Vegas for having complete control and flexibility over a montage that could involve any type of media. I’ve been doing photo montages since the 90’s and since switching to Vegas full-time in 2006 I’ve never looked back, aside from using Photodex on-site occasionally where you have to ingest photos and make a montage of them immediately.
Magix also has a discount through September 22 on their Photo Story Deluxe software which looks like it has a somewhat similar interface to Vegas but I’ve never used.