I think both the high dollar buyers and the cheap tool buyers base their assertions on opinion.
Here's some objective measurements that are relevant:
1) What is the history of the various companies on providing parts and service for their tools, and for how many years do they maintain those parts and services availability?
2) What is the track history of longevity of the various tool brands when used in a commercial environment? (kind of like the "how many Ford trucks still on the road?"
3) What is the satisfaction rating percentage of verified long term users of the tools? (Both in commercial and homeowner environment)
4) What is the history of innovation and development of the tool manufacturer? What portion of their tools are copies of off-patent tools developed by others?
5) What is the expertise level and level of knowledge of the salespersons presenting and selling the tools? How reliable is their advice on the suitability and applicability of the tools they recommend?
6) What is the warranty and recall rate of the tool manufacturer, or seller, if not directly warrantied by manufacturer?
7) How easy is it to warranty the tool directly by manufacturer, if buyer doesn't have easy access to the original reseller for warranty?
8) What is the wear/breakage rate of the tool, when used for extended periods of time? What is the servicability of the tool, when it becomes worn? Are parts available, if necessary?
9) What after-sale support is provided to users of the tools?
10) What is the quality control program of the manufacturer and reseller? What is the defect rate after QC?
11) What is the variance of performance between individual specimens, and between different lots of identical tool models?
12) What is the average 5 year depreciation percentage, of tools used in a constant, non-abusive environment?
13) What are the repeat results of the destructive testing done on a tool, when that test result is repeated after 10,000, 100,000 and 1,000,000 use cycles on a statistically significant number of samples?
14) What is the brand loyalty record over a lifetime of the user? What percentage of users continue to use the chosen brand over their career?
15) What tool brands do professional users gravitate towards as their careers devleop, and what tool brands do they move away from?