Fitting for gauge and pressure sensor?

So I'm looking at this:
http://www.nitrousoutlet.com/catalog...roduct_id=2714
and this:
http://www.nitrousoutlet.com/catalog...product_id=369
Whats the difference between these? I assume the more expensive one is better but why?
thanks in advance for your help.
Nick
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We stock the swivel style as well but we do not have the swevin style in a dual port at this time. However you can loosen the bottle nut and position the fitting in any position you like.
Dave
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