Axis are easier to play. (I can expand) Less micro intensive, have better armor, better AT, better AT weapons.
3v3 and 4v4 are not balanced because of resource spread and strength of Axis late game units.
Now discuss this if you wish. What are your thoughts on this?
Second point is true: 3v3 and 4v4 basically only work if you're not looking for anything competitive. When I play those modes its for crazy stuff like 3x LeFHs or other nonsense that should (and would) never work in the better balanced modes.
The first point is very debatable. For infantry, I wouldn't agree that axis is easier. OST Grens are basically made of glass and cost an incredible amount of MP to reinforce, especially for their performance. Once they hit vet 3 they're decent, but I'd take double-barred rifles, double-brenned tommies or even penals over grens every single time. PGrens are a bit better, but are still far too expensive considering what they lose to; and they have no long-range power.
OKW has it a bit better with their mainline infantry being somewhat competitive, but they have NO long-range power. Vet 5 Volks will lose to vet 0 tommies with double brens at long range. Even vet 0 rifles w/ double bars will probably win. Close range with STGs they're a bit better, being able to hold their ground vs. most mainline infantry, but the current call-in meta means they're almost always facing shocks, rangers, commandos, etc. to which they always lose to at close range.
Compared to the availability of cheap, double-LMG squads (which can fire on the move, unlike axis LMG42 upgrade), Okw and OST infantry requires far more micro to use.
For armor, yes. Except for some outlying stuff like getting two tulip-rocket fireflys, which can pretty much insta-wipe any armor, axis armor is better.... vs armor. However, axis armor is pretty bad vs. infantry. Except for Tiger (doc callin), KT (280f, requires all tech buildings) and the P4, there's pretty much nothing that's good vs. infantry (Ostwind is debatable since it hits the ground too much). Meanwhile most allied armor is good vs. basically everything: the comet, sherman, easy 8, t34, centaur, m4C, etc. are all great vs. infantry.
And no, I'm not saying "allies OP pls nerf"; the balance is pretty good except for some really strong, boring meta stuff (penals...). It's just a gameplay choice. If you like expensive, specialized units, play axis. If you like less expensive, generalist units, play allies.