Doesnt really matter. the su85 performs way better in the soviet army then the jp4 does in the okw. okw doesnt have access to the at nades or button up so supporting is much easier and a overall more effective combo then anything you can achieve with the jp4
I'd beg to differ. The JP4 perfoms better in the OKW army than the SU-85 does in the Soviet army.
There are a few things to take into consideration when it comes to the value of tank destroyers:
- The stats of the tank destroyers themselves
- Ability to snare enemy tanks for easy kills
- Vulnerability to enemy infantry based AT
- The armies ability to deal with enemy infantry, since the tank destroyer isn't going to help you with that.
Now stat-wise, the JP4 is superior. Their guns are close to the same, but the JP4 sports some very nice armor and a small target size. They lack self-spotting for far range but their nice veterancy bonuses make up for that.
Ability to snare goes to Soviets obviously, they have non doctrinal AT nades and have Button is some of their doctrines. OKW does have the ability to snare however. Just like the soviets, OKW has cheap mines for engine damage, and futhermore OKW has some doctrinal units with panzerfaust/AT-rifle nade. One of these units can spawn out of buildings for a quick surprise engine damage.
Vulnerability to infantry based AT is obviously in favor of the OKW. From the Soviet side there is only the AT gun that can damage the JP4, from the american side there is the AT-gun and bazookas, the latter being rather bad against the JP thanks to its thick front armor and the 'zookas low damage. Now the SU85 on the other hand is a lot more vulnerable to enemy AT guns and Panzerschreks. The SU-85s front armor is only 140, making it unable to bounce AT guns and the high-damage panzerschreks of the Germans.
And now the part where the JP4 completely outshines the SU85 in terms of better fitting into an army: dealing with enemy infantry. The OKW dominates infantry. Obersoldaten, vetted up JLI, panzerfussiliers, fallschrimjeager all decimate soviet infantry. On top of that you have have the cheap P2 Luchs or, if the enemy has many AT guns, the Stuka.
Now the Soviets, their only way to deal with OKW infantry is with armor. The only armor that can deal with OKW infantry is locked in another 120fuel tier. Going for shocks means no button, so that would mean the snare advantage of the SU85 is lost. The only other option is going for guards motor tactics, which will give you both guards and dual T34/85s. But those always come in pairs and are hard to get in a decent timeframe if you already invested into T4+SU85.