How To Compare Image/varbinary Column

what is the best way of comparing image/varbinary and nullable column in sql server?
this is what i do to find out the different in image column in 2 tables sharing the same structure:
Select *
From TblA s
Left Join TblB c On

s.Id = c.Id And Coalesce(Convert(VARBINARY(MAX), c.Image),'') <> Coalesce(Convert(VARBINARY(MAX), s.Image),'')
Where c.Id IS NULL

alternatively, i was thinking to compare the column with the size, but worry about the accuracy:
Select *
From TblA s
Left Join TblB c On

s.Id = c.Id And ISNULL(Datalength(c.Image),0) <> ISNULL(Datalength(s.Image),0) Where c.Id IS NULL

any suggestion/advise will be appreciated ~