Cat out of bag; sheep fer brains
Aside from Citrix burning docs on its own sites, there are still external sites distributing that reporting (https://cloud.report/Citrix/101917_CTX_eBook_5_Reasons_Why_F5_Market_Confidence_Declining-f-LR.pdf for example). Alternatively, you can get the even better 'Nine Reasons' document providing impartial technical advice to the US government about why F5 is crap(*) from https://www.uscommunities.org/fileadmin/hb/usc/Suppliers/Citrix/Citrix_nine-reasons-why-citrix-netScaler-beats-f5-federal-government.pdf.
Choice phrases such as, "Citrix NetScaler is universally recognized as an outstanding ADC", and, "Citrix NetScaler has become the ADC of choice for leading cloud providers and enterprises across the globe", highlight the insightful nature of the content.
Enough said and case closed - although, "Trust me, I'm a sales manager from a competing vendor", was never a winning strategy in my experience.
(*) By which 'crap' means 'not Citrix'.