Not true in poker. You must be thinking of another game.
While I'm not 100% certain, I believe that spades is the highest suit in contract bridge bidding, just below a no-trump bid.
And you would be correct, according to that vast repository of all human knowledge known as Wikipedia. (I had to look it up..)
"Suit denominations also have a rank order with notrump being highest followed by spades, hearts, diamonds and clubs."