Assuming you have the newer Whirlwind you have the flexibilty to use it either way. All you have to do is swap the launcher for the roof hatch. I have used my Razorbacks that way. I just swap the heavy weapon for the plain hatch.
Tactically speaking I have to agree with Broadside Pilot 100%. There are very few situations where you would want to use a Rhino in 4th edition 40k.
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