Hello,
Front flotilla is a bunch of mods done by the "9te U-Flotille" (9th U-flotilla), it comes with an installer and has been adapted to the last 1.4b patch (in fact the 1.4b patch is in included in the 34 mb download of FF and installs automatically with the FF mod). There are a lot of enhancements and i like it very much, however i installed the RUB 1.42 mod (1.43 when i'm back from the high seas
) and added some others. The RUB mod now includes some of the FF mod, so there is no need to install both anyway.
I thought the FF mod to be much better than the first RUB coming out, but the later RUB versions incorporate much more enhancements considering realism that i doubt the FF mod has it all. After all the RUB is updated and worked upon all the time, so it might be better to use this one. And there's certainly the operations mod in that new RUB ...
FF: Some info and download here (it is in german language):
http://www.9teuflottille.de/index2.html
It is very good, i especially like the radio mod they included - it is in german language and relates to real occurances in the appropriate times. You can install this mod as a single one into the RUB one as well.
Greetings,
Catfish