Currently only KT spearhead and Fussies are units that I would claim are "OP". Fussies just having too much utility and firepower combined, and KT spearhead giving way too many bonuses for "free" (well turret lock is not a problem with the current map design), especially with the commander upgrade for 70+ sight. Even Tightrope called it "Extremely broken" in one 2v2 cast.
Panzerfusiliers should lose the flare ability and get something else in return. Jaeger Light Infantry should get the flare as they are a more recon oriented unit. Having Panzerfusiliers with Flare kind of defeats the purpose of JLI since Panzerfusiliers not only arrive sooner but scale better and have better recon.
King Tiger itself is not overpowered but the vision bonus of Spearhead gives it 50 Vision which defeats the weakness of the Turret Lock if it can see in a huge radius around it. It turns into a meme once you add Panzer Commander and you get +70 vision.
OKW has plenty of sight options built in, such as Vet 4 Volksgrenadiers, Kubel, Spotlight Halftrack, Puma, they don't need almost every single unit in their roster to have massive sight radius increases when other factions have significantly less options to choose from.
This is also the reason why you rarely see the Spotlight Halftrack in games. Why build it when you can get extended vision from numerous other units.
I personally hardly ever play with pfussies so I won't comment...
You admit to only playing USF/Axis yet you and your boyfriend Vipper always appear in most balance topics related to Allied Units. You should preach what you say and not comment on things that you have zero experience with. Axis or Allied fanboyism is toxic to the game and drives away newer players.
Which is how a CODGUY is created. When you have more hyperbole than skill.
CODGUY does have some valid points though. I may not agree with the severity of it but it does take away from the experience of the game when it turns into Blob vs Blob combat instead of involving any form of real strategy or tactics. Also looking at his profile he does have more games than you and plays more factions which adds more credibility than someone who plays one faction only. Any person who plays a single faction, Allied or Axis should not post anything in regards to balance. Living in either bubble only leads to confirmation bias and lack of progress towards balance.
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Anyway back to the original topic. If I was you I would have made either a Luch's or Panzer IV. Depending on the map I would have also went Fortification and set up S-mines/Made bunkers to limit my opponents movement due to him going with T1 opening. This means no mortar/AT gun which would force him to either backtech allowing you to have a bigger opening with your vehicle/s. Being able to dictate the flow/pace of the match is more important than getting out any additional infantry squads.