Legally, you can make such claims.AppGuard is the universe's most effective security software - period. No qualification is needed.
I can also state AppGuard is the universe's most capable, most efficient, etc, etc without qualification.
And there is good reason to believe that such claims are true, although I am not one to say, because I know almost nothing about corporate-oriented software, neither am I a professional tester.
But the soft-sell approach is usually more effective.