Both bikes are decent. I'll vouch for the quality of DiamondBack. Their bikes are as well made as any other in this same price range.
Between the two, it all depends on which one is more comfortable! Test ride them both and decide for yourself.
L8R
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"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger