I know you are looking to compare the Uniden model to the Whistler models, but FWIW:
I've used Uniden BC 796D, 396T, 396XT, 996T, 996XT and both the 436 and 536 to monitor the Minnesota ARMER system in the Twin Cities over the years. The x36 scanners are far and away better at dealing with the multipath distortion than the others.