I've own or have owned Guerlain Homme, Intense, and L'Eau. Out of those L'Eau is more natural smelling and a lot smoother. I haven't smelled Boisee, but if it's anything like L'Eau it's going to be a quality fragrance. I'd be interested to hear the opinion's of people who have both L'Eau and Boisee.
L' Eau is all about the lime and light woods and is great for summer. L' Eau Boisee is light woods and vetiver. Boisee reminds me more of HeWood, Declaration L' Essence or a smoothe version of Terre d' Hermes than it does L' Homme Eau. I see no conflicts and own and enjoy both.