On the E-shop page of DCS, I see two ways to get Black Shark 2:
1. Standalone version, which costs $39.99
2. Black Shark v.1 - $9.99 plus Black Shark v.2 upgrade - $19.99, total = $29.98
From what I see, it's ten dollars cheaper to buy the first game and then upgrade, than to buy the standalone release.
Is there any difference whatsoever between an upgraded version and the standalone, apart from the added effort to install 2 parts instead of a single installation?