Slitherine

There are two units that I really like that IMO are rarely used. In Allied Corps British only, I change my Hurricanes into over leveled Kittyhawks. The Spitfires have such poor fuel they have to RTB a lot while the Kittyhawks can stay in combat. In all the Campaigns, the Spitfire is my least favorite fighter.
The second is an A+3 SdKfz 10/4. With eight movement it almost always gets an attack. I farm an 8.8cm Flak 36 for the A+3.
Does anyone else have a favorite less used unit?

There are a few I rarely use, but one category I don't use is fixed AT/AA, with the (obvious!) exception of the 8.8cm. I'm not very adventurous, so I tend to stick with favourites in each category, upgrading if and when it makes sense.