You've probably already made your decision, but I can't help chiming in
It all really depends on which era you want to collect. The 21c Panzer IV D is quite appropriate for, perhaps, a Blitzkrieg setup, whereas the FOV Panzer IV F1 is from a little later. The 21c version is accurate to the Panzer IVD, as is the FOV tank to the Panzer IV F1. Both tank types did see use on the Russian front.
The FOV version is the one I would go with however, as it has the most detail, functionality, and accessories. The weathering and paintjob are also excellent. All the main hatches open and you can place the commander and crewman in the turret. The "924" tank is the best of the 21c Panzer IVDs, but still looks a little plain.
You won't be disappointed with the FOV tank
