Is a 5 Year Arm a Good Or Bad Idea?

I own a home and plan on staying here for 10+ years. My current rate is 6.125% - 30yr fixed. I am being offered a 5 yr Arm at 5.125%...and a 30 yr fixed at 5.75: Is the risk of the 5 yr arm,that in 5 years rates will have risen and I will only have a higher rate available? Need help?
thank you.
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