Revised is the best tested game of all the series, it’s almost perfect is you ask me, at least in that sense. In some areas seems they tested all sort of strats. For a 4-5 players game, is almost or totally balanced. I think the bids grew too much in late times, but I see that LL and no tech could have corrupt the balance
AA42 has no testing in all, they simply copypasted annyv. rules to Revised map with some really bad changes in American mainland. It also lacks tech and even the components are of lesser quality. Since trannies doesn’t defend and Germany has a very strong naval option early game, I think it gives advantage to axis. Is a great setback from Revised
Annyversary has a great core ruleset and some bright ideas as the new tech and SBR systems, the new subs and the NOs, but even if some tested had done in Europe, still lacks playtesting (specially in Asia), giving obscene advantage to axis in 1941 scenario and strong advantage to axis in 1942 scenario (with NOs, the default in most games). It has a patetic fantasy set of un-rules for China. But still, you can make it a great game (in fact, better than Revised) if you play 1942 scenario with some bid for allies or if you make some house rules for Asia (not LL, that gives even more advantage for axis)