Break Cranny or Heal?

H,
What Skill is most suitable for cav n arc army, is it Break cranny or Heal along with Hidden attack.
What techs to upgrade?

With a cav/arc army hidden attack isn't as important as when you use cats. I would recommend heal and break cranny. Healnis good for saving prestige during battles and break cranny is good for both farming and when you are attempting to starve someone.

could you explain why hidden attack is important for cat army n not for cav/arc army? what ratio should my cav/arc be? 10k cav/5k arc? ? or arc should be way more. thank you

Cav/Arch army you should have a decent hidden attack (~5) and as usual, a high break cranny. Unless you have a staggering amount of cav/arch then you will almost always lose a few troops during every battle, so heal is good as well. Hidden attack hides your attacks, and since catapults are slower than cav/arch, the enemy will have time to prepare for your catapult attack rather than the short amount of time in which your cav/arch reach there. However hidden attack is still useful for cav/arch.
I use a ratio cavalry:archer 2:1, but that depends on your personal preferences.

It seems easier to work towards achieving 250 cats n inf, compared to 2.5k cav for 1lvl fort farm... or is there any other way to get 2.5k asap. Also, can someone provide the number of cav losses taking a fort 1lvl...

People like break cranny but I am surrounded by more inactives with Max warehouses than I can count so it's of no use to me.

People say hidden is more necessary with cats than cav, but I beg to differ. Any warning is a good warning no matter what unit attacks you.

But ultimately, when fighting with a unit almost guaranteed to take losses, heal reigns supreme. It equals less losses thus more prestige.

To me, prestige is much more important than resources.

As far as tech, max them all.

Heal skill proc rate is it based on chance or happens everytime like break cranny? i must have done like 20 battles so far not even one heal proc.

Heal will heal a percentage based on your skill level ANYTIME your troops are killed in battle. This will be noted on your war report.

I have fought atleast 20 battles with 4lvl heal n i have not seen anything that says cured in war report.. one example : i attked with with 54 cav n lost 2 but war report didnt show cured n i had lost 2 cav..
maybe i have a bug?

I have fought atleast 20 battles with 4lvl heal n i have not seen anything that says cured in war report.. one example : i attked with with 54 cav n lost 2 but war report didnt show cured n i had lost 2 cav..
maybe i have a bug?

Heal will heal 2% of all dead troops per level of the skill. 
If you have a lv4 heal, that means you heal 8% of your casualties. 
8% of your 2 dead cav is 0.16 cav, or basically the big toe of the guy who rides that horse, which is why you're not seeing results. 
With a lv4 heal skill, you'll need to see at least 12 or 13 cav die before any get healed in battle.