There is no trauma like with a bullet when shooting arrows, the only thing contributing to the kill is what the blade slices. The bigger the blade the more cutting area. Go with mechanical. I shot mechanicals for years, (can't hold bow now bad shoulder) and never had one blade failure so take the "fail to open" excuse with a grain of salt. Mechanicals do need high kenetic energy so if you can't handle a higher poundage bow stay with the fixed.
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