What is the best teeth-whitening product?

What is the best teeth-whitening product that I can buy to whiten my teeth? Crest Whitening Strips? Rembrant? Other? And, which one in particular? I mean, like the "Advanced" one or the "Total" one or what? Thanks.
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I tried Crest White Strips, Colgate Simply White, Rembrandt two-hour whitening, and lots of whitening toothpastes. So here is my opinion (from experience) on each: Crest White Strips - hard to keep on teeth; do not expect results like those on the commercials (it would probably take repeated usage before your teeth are as white as the models on the commercials); the taste of the gel on the strips is horrible and does not go away easily; I did not see a small change until I was finished using the (14-day) package. Colgate Simply White - Does not stay on teeth well; wipes off too easily; if you can avoid your teeth touching your top lip, then you'll see results much faster; the taste isn't as bad as the whitestrips and the results are actually better/ faster than that of the WhiteStrips. Remebrandt Two-hour Whitening - horrible! I evenly distributed the gel into the tray and put the tray nicely on my teeth, but for some reason, white spots appeared on my teeth as a result of the gel whitening only some areas I do not recommend using this product. I'm currently using the AltaWhite teeth whitener and I have noticed a change in color so it's working quite well. I'd reccomend you try the AltaWhite trial and see if you get the same results
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