After trying: teak oil, Cetol (with and without the Cetol gloss overcoat), polyurethane, and old fashioned varnish, I have come to the conclusion that oil looks the most natural (and to me, the best), but it requires the most upkeep. I have tried three different brands over the years, and none looked "new" for more than a couple of weeks. Just so frustrating. Cetol looks good, but not as good to me as oil. However, three coats of Cetol will look almost new for an entire four month season. I just recently applied the Cetol gloss overcoat. It looks good, but I don't know how long it will last. If you like the bright look, polyurethane doesn't look quite as nice as varnish (nothing looks as good as a well-applied coating of varnish that looks a foot thick), but it sure is easier to apply. Poly and varnish don't need as much upkeep as Cetol, but when you do need to reapply, they need to be completely stripped off. In short, your choices run from looks great, easy to apply but doesn't last long (oil) to looks great, lasts long but is a beast to apply (varnish). My choice: Cetol; I think it's the best compromise between ease of application, durability and low maintenance. Your mileage may vary.