Road bike on road v hybrid on road, green-lane & tow-pat

I'm going to start doing a 32 mile each way Rugby to Coleshill commute, initially twice a week, consisting of mostly flat to smallish-hilled country roads. My budget is £800 and my choice is this:
Do I go for a Trek 1.7 road bike and stick to the roads and carry a back-pack?
Or do I go for a hybrid like a Cannondale Bad Boy so I can travel half the distance on a canal tow path, use the occasional green lane and fit panniers?
The road bike will be quicker but the hybrid gives me the flexibility to go off road making the commute possibly more interesting - but will this flexibility be more than offset by the hybrid's lack of speed when on the road?
Any help will be appreciated.
Do I go for a Trek 1.7 road bike and stick to the roads and carry a back-pack?
Or do I go for a hybrid like a Cannondale Bad Boy so I can travel half the distance on a canal tow path, use the occasional green lane and fit panniers?
The road bike will be quicker but the hybrid gives me the flexibility to go off road making the commute possibly more interesting - but will this flexibility be more than offset by the hybrid's lack of speed when on the road?
Any help will be appreciated.
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I certainly wouldnt fancy long distance on a hybrid it makes far harder work out of it.
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You'll have a good performance on road with great comfort and protection (sometimes commuting is no real pleasure and you want it to be as quick as possible); average size tires (28 by example) will make easy paths accessible; use of panniers, or any bag fixed to bike, will be far more comfortable than a backpack for such a distance.
A cyclocross bike would be fast on road and be good off road, and could have mudguards and panniers (eg Specialized Tricross Sport £699). Or a Giant SCR can have mudguards/panniers. I think Specialized Allezs can too. But if you want the Trek 1.7 you can always use a seatpost bag like the Carradice bags, and use race blades.