PH has wonderful sillage and longevity, with a great airy-fruity smell that is surprisingly strong. I don't see how you are drawing a comparison to Rochas, even when it comes to sweetness. The two scents have a totally different function and effect in my opinion. Guess & Reaction I guess could be considered similar only because I consider all three to be "jeans and a t-shirt" kind of frags.
Why don't you just test it for yourself? Your nose knows you better than anyone else's.