Was this a fresh install? Ideally, OVA is used for POC and small installs. It's far quicker to use the ISO when doing fresh installs since that would allow for customizing the resources. The OVA saves about 20 min since it is generated after OS install; but after opening TAC, resizing, reloading - that 20 min saved may be a moot point.
I generally install from the ISO whenever I can.