My toughts about flower vanity with stats!!

[Energizeric]

Do you think that the damage will be more on mythic gun than the arcane staff?

No, I don't think it will. Last time they released a mythic gun (level 31 runic), it had 50-55 more damage than the best legendary staff at the time, the Nordr Jewel. The kershal has about 110 more damage than the best magma staff, and even has about 80 more damage than the level 36 mythic staff. I'm guessing the new mythic rifle will come close in damage, but the arcane staff will still have the highest damage, and the other stats of the arcane staff will still be much higher. A good comparison is the level 31 maul compared to the level 36 glaive. Maul is still better.