How to Test switches from 3 manuf to find out which is the best

Greetings:
Question 1:
I have to deploy 19 L2 switches and 2 L3 switch. Need help in picking the right switch. I am going to use SNMP and Sflow with Solarwinds or Auvik.com network management software to manage these switches. So it comes down to the hardware performance of the switch.
I have the three switch models from the manufacturers on trial – need to figure out how to test them. Is there a step by step document to conduct this test ?

Question 2:
Switch model 1 – showing switching capacity, forwarding rate and stacking bandwidth in duplex where as other switch manufacturers does not mention duplex. Is switch manufacturer 1 inflating the forwarding rate and stack bandwidth?

See switch details here

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