It doesn't matter, just pick which 1 you want to give your pokemon & leave the other 1 in your bag...
They give the same boost, however the Rose Incense does however help breed
aside from the similar boost it gives that Miracle Seed gives as well...
_________________3DS Friend Code = 4441 - 9336 - 3527
(Be aware that I must also add you so in order to know you added it, just maybe...)
Eevee Breeding Project leftovers are Available here + rest of my trading wants & haves...
Lawence Codye's Trading Thread (Gen 6 / X & Y)"The Nine Tails of Subconscious - Lawence Codye"