It's really about the same, if you don't skip medic bunker.
40 medic + 40 conversion + 70 puma
50 + 120 + 70 for soviets.
Keeping in mind OKW fuel reduction and the delay between trucks coming onto the field and the timings are pretty close if both players rush for their respective vehicles.
Actually you don't even need the medic truc, you get all you need for a while in the first truck. and then go over to the mechanized. Don't forget that you also get an ability to scavange and turn ammunition into fuel. Which further shorten the time it takes.
Also consider that the soviet will either go Tier 1 or tier 2, and probably get molotov and/or AT nades. Plus if you play against OKW you WILL whant AT nades and most likely Tier 2 to beat those early armors. If you like tier 1, you are kinda screwed.
But what scares me as the russian isn't the Puma but the flaktrack, early games the soviets have no armor, the puma is a waste. But the flaktrack runs over your infantrie supported by his own infantrie which will then be uncontested.
Overall, my opinion on the OKW can be resumed to : Too soon.
ARs too soon, armor too soon ...