I think the best overall army is a mix of all 3, BUT this only works if you have a massive army, which I do in all of my servers.

What I like is that you use all of the advantages, infantry's bonus and vehicles bonus.

I NEVER lose range, the reason is because I have a couple pure armor squads.

Also, the reason why you need a massive army is because if someone has only tanks then you only send vehicles, making your army 2/3 smaller.

For me this has always worked, and right now I am doing 3 attacks on one server, one person had only tanks, the other had only vehicles, and the other had mostly infantry, so my army was split up perfectly.

I like using my style because you get to use all of the bonuses, but if you need your entire army and the enemy has 1 unit type then it is worse.

but that require a big army and loads of armor

talking normal noob people like me

i normally just use equal number of squads for each chassie type
ex 3 infantry squads 3 vehicle squads and 3 tank squads
it works well for me i use the infantry for newbs and vehicle and tank (backed up with infantry) for wars and its gotten me up to rank 35 on f2 after only playing for 3 months

You don't need loads of armor, and you should be able to get a big enough army about 1,000 ticks into the era.

pure infantry is the best way to go because who builds their army to fight against infantry effectively and i dont build pure infantry becuase has a very high maintainace because they have so low hp but if you have a really huge infantry army it will do alot of damage.

And with my army I would simply send my concussive tanks to kill your infantry.
They get no bonus against tanks.

yea but concussive tanks make up what like one tenth (just pulling a random number) of your mixed army so you would have to have an army 10 times larger than them just to have an even battle.

IMO having only one chasis type is the way to go. INF are probably the most effective because not many ppl build large amounts of concussive units plus they get a damage bonus but like rueldinho said the are high maintenance because of their low HP

no you should have at least two types because what if some plans ahead of time to attack you specifically they could make a large anti infantry force and wipe you out

as for the unit types each has their advantages pick what fits you best

infantry have advantages like quick and cheap to replace, quick to heal after a battle, can easily take down newbs, good in short wars, cheap to move large armies around

vehicles are a good balance when used in combination with tanks (can take out less defended or less important targets freeing up tank squads) or infantry (can give decent power to an all infantry army especially against tanks)

tanks high damage and hp, more likely to live through battles, good for long wars

Actually, that would be 1/3 of my army.
As I said I use 1/3 inf, 1/3 veh, and 1/3 tanks.
So I would have only concussive tanks attacking your units that have only 33% explosive or less.

I am confused,

I have been playing a little over 500 ticks (maybe a bit more not sure)
I have 5 squads

Concussive Tanks (3/7)
Explosive Tanks (3/7)
Beam Vehicles (5/10)
Explosive vehicles (5/10)
Beam Infantry (9/21)
(armor/range)

I'm still in the early stages so changes going forward can be easy. I was going to build concussive Infantry next to balance things out but after reading this I became a bit confused.
First, if I send a mixed army of tanks and infantry and all my armor infantry die; will the tank armor still protect them or will my range infantry get chewed up?

Second, If I do try having only 2 chassis types in my army what would be more effective against infantry: Concussive Vehicles or Concussive Tanks?