You will get a wide range of opinions on this subject because, like a lot of things in life, people will have their "favorites "
I think a fair maxim is "You don't get, what you don't pay for" All of the various products will do the job to a greater or lesser degree with various ranges of efficuency. Some have a pleasant perfume that lasts, some dont.
A lot will depend on whether you use your facilities just for liquids rather than solids, and how often you choose the empty the cassette. Some do it daily and some wait until its full.
Its probably best you try a few out and see which one works best for you.
Each to his own.