At At Exit...not trying to upset anyone. That really isn't my intent. Sometimes words on a screen are hard to get the "tone" from so I hope not offend..but....
A class AB (no such thing as BJT AB1) would actually be worse in my opinion if it's a 2 x 4 because a class AB amplifier actually has more gain. While this config in class C (no negative bias applied but no positive either to even though it is not deep into class c it is nevertheless) a 2 x 4 design is still completely overdriven and out of control either way. It can make a watt meter look good but that's about it. Remember that a class C amplifier for anything but FM that isn't directly modulated is going to already have massive amounts of by products and wasted power. Then, overdrive it beyond ridiculousness and the results are just that. While it is true that a class AB amplifier operating properly will draw more current at least you know that what you see on the meter is actually useful for the most part. Worried about the heat? Solve that by proper design and cooling as well as not driving it to the point of meltdown and because you don't have those two extra transistors in there you are already saving some current draw and heat vs if you had them and they aren't doing much for your signal.
See..some really smart people get together and design these things and are aware that they aren't right but don't care. They have a hate and discontent when people like myself come out and tell it like it is.
The builders of even some of the old tube stuff such as Elkin and D&A used to use such "tricks" to fool people using purposely "loose" bias or screen supplies to cause a lot of."swing" on a meter. One of them I have met and when asked got a big smile on their face, laughed and stated that if people will spend the money not knowing any better he will laugh all the way to the bank.
Just run a good amp, a good clean radio, and most important a good antenna system and have fun.
Myself I have in the past been offered money to go to the "dark side" and even partner up with some of these guys. I refused and quite frankly all they do is push junk and use marketing and customer loyalty (no one wants to be told or admit or accept that what they bought isn't good..the powerful thing called pride) and they know that. Anyways..I will back out of here and not say any more.
Ultimately it is your decision and your wallet.