My favorites are

Sword Infantry: The Loan Sword Ashigaru
- Theese cheap infantry units are my favorites because they are cheap and numerous. They get the job done in a infantry assault if they are backed up by proper support, a leader general and proper retainers (I always use Drill Square, Yaguy sword something..:), and the way of the Ikko Ikki, which boosts ashigaru defense and morale, even though they make samurai cost more. I also use the inspiring orator, if the battle has medium ore low funds

Archer: Bow Warrior Monks
- 1 reason..... their all-round skirmishing stats! Theese archers can pwn enemy bows in every way, and with the clan upgrade "increased range", they are killers in siege battles

Spear Infantry: Yari samurai
- I know that theese units might not be a favorite, but i generally dont care much for spears in battle. The only tactic i use them to is to counter enemy cav. Yaris are cheaper then naginatas, have more bonus vs cav, and have the rapid advance.... a couple of those and im fine

Matchlock: Matchlock Ashigaru
- They might be slow and have a poor range, but they are matchlocks, and their bullets as good as any others.... i cooperation with my loan swords, i can pwn almost every other infantry force because of numbers, cheapness, leader gen and proper retainers

Cav: Yari Cavalry
- Theese cavs are my 1st way of countering enemy cav. That is usually my tactics. I want to defeat the enemy cav (ore match them 50/50), so that they arent a thread to my main core and sually skirmish heavy army.

Special unit: Fire Rockets
- A way of countering campers big time..... a frightening unit to bring in a battle woth choke points and againgst infantry heavy campers. I have a lvl 9 veteran of theese and it is simply awesome!