The Lala is not actually particularly "easy to fly", easy to fly for a noob usually meaning some combination of turning ability, stability, and user-friendly gun package. There are a dozen airplanes that are "easier" than the La7 in that sense. No, what the La7 brings to the table is the ability to *completely outclass*-outrun, out-turn, out-climb, out-accelerate-literally the whole field of unperked high-speed E fighters in the LW arena. Its non-perk status is literally unconscionable.
The Spixteen is a couple notches easier, but still probably not so "easy" as its stablemates, the V/IX/VIII. Once again, what it brings to the table is double-superiority as a fighter to a huge chunk of the LW plane set.
Honestly, if your idea is to distribute a plane that will gives noobs a chance, by all means, unperk the F4U-4.
Say what you will about the C-Hog (and I'm not advocating unperking it) but it has one important, glaring weakness that neither of the above have: Thrust/weight ratio near the bottom of the barrel. This is a weakness that will haunt the C-Hog whether it is trying to stay fast and E-fight/bnz or getting bogged down in a furball. This is weakness that is very exploitable by a large number of other fighter types that simply does not exist for the La7 or Spixteen. I think entirely too much emphasis is being placed on the gun package and not enough on whether or not most planes have a corner of the envelope they can exploit against X to avoid being in the gun sight in the first place.
In the case of the LA-7 and the spit16, I don't think keeping consistency across the board is necessarily the best answer either.
If we kept things totally consistent, only those with the skill required to earn perks would fly the perk planes. The "beginners" would have to fly the lower-performance planes.
That sets up a possible "vets in uber-rides vs newbs in early rides" scenario, which wouldn't be very fair either.
I think it's an important game-leveler to have a few "uber" rides be free, when "consistancy" would mean perking them. The LA-7 and Spit16 fit the bill perfectly, IMO. Let 'em have a ride they can experience some success in, learn some basic skills in, but earn few perks in them, so they have an incentive to try some of the other planes as thier skill improves.