USF mechanized fit better the ChaosKrieg rules than Ostruppen and that's not a question of jeep vs ostruppen but a mid-tier transition from them.
You need the T4 and BrumB/Panther to fully support your Ostruppen transition while USF only need a pair of sherman. Thus USF able to close the game faster.
That's not a question of balance here but variation in powerspike for factions/commanders designed around 500vp matchs.
On a personal note, even if the idea felt more exiting at the beginning, it has been the most boring tournament to watch.
No I can't say I agree. If ostrruppen "need" (which is debated) Brumbar/Panther it is because they they are not good after minute 5.
The fact that they where used in 250 VP tournament is a strong indication that the commander does provide an early advantage.
Actually what they seemed to "need" was 251/222 to support them.