I would like to build a small wind tunnel to test a miniaturized wing/airplane. I have two options, using axial blower (picture 1) or using centrifugal blower (picture 2). The first will be the wind source for "pipe" tunnel while the second one will be connected to a ducting tunnel. The size and the power (cfm) will be provided as per requirement.
Then my question: which one is better of the two? Or, is any other better alternative?