The cannondales use a falling rate suspension (including the Rush). Trance uses a rising rate suspension. What this means is the Cannondales will typically use all the travel on smaller obstacles, while the Trance will need a bit of a bigger obstacle to use its travel.
Although Trance is 1" less suspension this may not be such a bad thing. With a falling rate suspension you cannot use as much sag as a rising rate, or else you would bottom out very fast (this can be muted somewhat by the use of a progressive air shock).
From the AMB mag reviews of the Rush, they said the Rush is not as harsh as the Jek. So, one would expect the Rush to be a far better suspension (than Jek) and the review loved the Rush for endurance type events. I could rave on and on about Maestro and its benefits...loves the rough stuff... solid pedalling..... but ultimately you must buy a bike that suites your needs.
Giant fans close your eyes and don't read any further.... (but I would get the Rush if I had lots of money to spend

) Now all you Trance owners can have your say....