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"