What is the best stain for front deck,ours is peeling & have to redo?

Used Sico, which we used on fence and it is great, however on deck it is peeling and have to redo every year, we used pressure treated wood, and waited a year to do it, and have to redo every year...this is 4 years in a row .....getting difficult as we get older...any help would be greatly appreciated....we live in Northern Ontario..Sudbury area....
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