These two anime shows created in Shirobako are completely different in genre so naturally these two episodes are also completely unique and different from each other. Each one would have actually deserved its own review.
The first OVA is the first episode of "Exodus", the anime produced in the first half of Shirobako. It's a story of a group of 3 idol-wannabe girls who get framed and have to run away from the police while still trying to realize their dream. It's a light, comic anime. I won't give any further details because since this is only a single episode, every further detail will basically be a spoiler. If this were a real anime I'd probably give it a 7.
The second OVA is the first episode of "Dai 3 Hikou Shoujotai", the anime produced in the second half of Shirobako. Completely different in genre from Exodus, this one is basically a thriller. It's about a group of five combat pilot girls from five different countries (Japan, USA, Russia, Israel and Sweden) who join forces with basically the entire world's air force (or rather what's left of it) to fight-back against a mysterious enemy of the human race, referred to as the "builders". Again, this is only a single episode so every further detail would be a spoiler. If this were a real anime I'd probably give it a 9.
If you plan on watching these I will point out that the biggest drawback is that these are anime which could have easily been real shows, but unfortunately they aren't - only these first episodes were ever made. While "Exodus" is just your average idol-parody anime, not too interesting and its end is presented in Shirobako, "Dai 3" is amazing and it is very unfortunate that this episode will leave you waiting for a continuation that will probably never come. Even with the parts of the story told in Shirobako, the plot is not nearly complete. I'm writing this review after watching Shirobako a second time - the first time I had hopes that this will be picked up as a real anime but 4 years later that doesn't seem to be the case, which is a real shame because it could have easily been a huge success.
Bottom line - If you're OK with a good story that begins but never ends then these are definitely worth watching, however I probably guess that at least some people will decide to avoid these due to that very fact.
Sound and art are OK, could have been better.
