If the comparable model of the Aruba 8320 Switch series is more expensive than the HPE FlexFabric 5710 (I'm not totally sure about that) then go straight with the 5710 and no regrets. The 5710 is Comware 7 based, fits perfectly in a Data Center environment, it's pretty robust (from both the HW and SW PoV), it has plenty of DC related features (IRF included if you have more than one to cluster) and had a proven track of being a good workhorse in DC...if instead, it's a matter of budget, there are alternatives for sure.