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Both are great radios. As Kris mentioned the HP1 has everyrthing you would want loaded in, waiting for you to pick and customize "favourite lists". And, as Kris said the HP1 can handle multiple towers in one favourite making it a great scanner to take with u in the car and anywhere in North America.
In a perfect world with your 2 scanners I'd keep the 996 as your base and have a HP as your mobile type.