The unit type you use the least?

I pretty much use only Infantry, I don't know why. Could be a coincidence on characters, or something. As for Armours, I tend to find their mobility uncomfterble and I never bothered to heavily optimised BK and Henry beyond a certain point.

Fliers, they need a lot of skills to work well and i dont have the resources.

I use armours the least. I like my mobility, especially if I want to play aggressively. Armour march is good but I don't have much of it and the condition at start of turn is not always easy to work with.

I use fliers the least but that doesn't mean I use don't them a lot I use all of the movement types a huge amount, but fliers is still my least used.

Armours. They're slow and I don't have any armour march. Or Vengeful/Bold fighter, or DC...
Armour emblem is expensive to build.

i rarely use fliers anymore tbh, ever since Abyssal mode crawled out of its fucking coffin, horses became a lot more valuable

Flyers. Not by choice but because of a lack of good characters.
To this day, i think all movement types can be played and be great. But you need characters and, sometimes, specific fodder like DC that can be hard to get as a p2p or f2p.
What i would like is an armored healer option. The problem with pure armor team is that you lack heals, daggers and dancers. While i think dancers and daggers should not be available (for fluff and game balance reasons), a healer would be nice.

Armors by far, their movement plus their tendency to be more defensive makes me only use them sparingly. I've begun to lean towards playing offensively/mixed phases. But it could be I have a tendency to like using Ranged units which a good bit of them tend to be glass cannons. My favorite ranged unit is Micaiah, although with DB4 and Desp/BA she certainly has some very powerful offense to her!

Armors.
Easy reason: they are bored for me...
You have to have Armored march or Armored Boots (only work at 100% hp)...
They are strong but for me there are infantry heroes who can do a similar work (like Legendary Ike, Fjorn, Eirika...) or even better.

My top most-used types on Fire Emblem:

1. Cavalry. Specially Reinhardt, Gunnthra, SMEirika... I mean, they destroy everything and with a dancer they can just replace on a safe place.

2. Infantry. Since I usually I play with mixed teams, I like using some mages or daggers (honestly, only Jaffar), healers, dancers...

3. Flier. Specially two flier heroes: Axura and BNinian. For me, the best dancers with diference. I like Fliers and their playstyle reminds me to cavalry emblems in some way.

4. Armor.

In my case it's armored. I only use them for 10th stratum monthly or the "defeat on all-armored units" quests. I dislike their only one-square movement, I know there's armor march but it's limited and the c skill slot is better for buffs/spur/ploys.

It's funny how I use horses the least (except Horse healers). I used to use them the most because let's face it, Xander with a 40 def from Fury 3 is still very high among others. But I go for more mixed teams now because of the Tactics skills.

It used to be fliers because I didn't have a great selection to make a team with but now it's armors. Maybe its because I don't have the fodder for the crazy and fun builds (would love to use bold fighter on Effie and Henry) but they're not as fun to use as the other movement types.

Armors by far. It used to be horses, but what do you know, there is a new cancer in town baby.

Cavalry is my least used movement type, followed by a armor. Cavalry used to be my biggest rival, and I didn’t want to join the club of the cancerous Rein/B!Lyn combo. I enjoy using armors up to a point, they are just so expensive to build and hard to merge (5* exclusive armors are the only ones ii really like)

Horses. I'd probably have some sort of team if there were more decent Greens, especially Axes. Other than that, I only have a few units who are consistently good, but not enough to make a solid team comp out of. They work for Stratum quests and as substitutes for GHB Quests and such, but there's nothing concrete there.

I don't use armors unless I'm forced to, despite having DC, Zelgius, BK, LALyn, HHenry and fact that my armor emblem is ready, I changed HHenry's weapon to gronowl and refined it, I still don't like armors.
I just hate that one space per turn. I guess I'm just horse fan.

It’s a weird question because I use all four - I have a committed Flier team I use frequently, an armor team I use frequently, two mixed emblems (one being three infantry and an armor, the other being three infantry and a calvary).

So I guess Calvary since it’s the unit I have the least number I use?