Dissie Ravagers are sort of useless if you're going to bring Venoms they can handle and AI. DL are best for ravagers.
Personally I prefer 3 ravagers over any air, for the simple following reason. the more you have fielded on turn 1, the more you force your oppenent to choose what to target. since everything in your army packs a punch, one of those punches is going to get through and wreck them. Also, with flyers they are statistically on the board for only 1/2 to 1/3 of the game. having one flyer for some board control can be good or just to deal with enemy flyers but 2 of them is asking for death versus most meta armies. simply put, ravagers are there from turn 1 and flyers are not.
hope this helps