Which vuln scanner is the best between Qualys and Nexpose (InsightVM) ?

hi, I’m analyzing several vulnerability scanners including these two (Qualys and Nexpose)… especially if they are used by medium to large companies or organizations, which one would be the best in your opinion?

For me it is a fairly equal challenge, I did not understand but if they are around the same costs or one is more expensive than the other … what do you think ?

I test vulnerability in system and software since 2006…

  1. test prevention;
  2. protection antilogger(protection against spywares of type keylogger, screenlogger…); :-TU