I am working as a researcher in the field of optical coatings. I do not have a lot of experience with anti-fog coatings, but I found a few test that could be performed to estimate the performance of coatings.
Anti fog tests (found on the web):
Breath Fog Test - No fog formation after direct breathing.
Shower Test - No fog formation after 45 minutes exposure to the warm moist air of a hot shower.
Hot Water Test - No fog formation after exposure to the vapor from a vessel containing 175 F (80°C) water.
Freezer Test - No fog formation after transfer from a freezer to a humid environment.
Immersion Test - No loss of anti-fog properties after a 24-hour water soak (followed by air dry).
Coating adhesion:
Tape test (different grades of adhesive are available)
pencil test (mostly for hardness, but can give some information on adhesion; you can use a set of B, HB, 2H, 4H pencils for that)
scratch tester.
Many of these test are described in details as standards (ASTM for example), but if you just need to compare two coatings, just make sure that you use the same procedure to compare them.