The only difference between the editions is extra aircraft; they have indicated IIRC that the premium/deluxe aircraft will be available for individual purchase this time (we’ll see when the Marketplace arrives) and the Aviator edition additionally includes other planes that are available for purchase.
So unless you want to bulk-buy all of them, you don’t need to get the fancy editions.
As noted, the simulator is all-around a bit of a mess right now 
so you’re not going to get your money’s worth out of any of the planes right now. Whether you want to spend more money at once or later is up to you, your budget, and how you like to balance money spent against enjoyment achieved.