I have 2 favorites:
Type VII : A really nice Sub for its size. It really is great to avoid DC's and its a strong ship
Career with the VII: U-505
Status : Sunk
Reason: I was on a patrol in '43 and I picked up an Sound of an ship...Well I thought I heard an Small merchant maybe? medium speed(Not confirmed)...Mmmm great! lets use my Deck gun. It was night and it was my first ship spotted. I was an greedy bastard so I surfaced and directly shot an shell at the point where I saw water moving by its bow...HIT!!! Yihaaa....but I was suprised by the following picture....I got an answer of a 4 big battleship!!! they shot everything they got at me resulting in an instant death of my crew and my ship! It happend to be I shot at an Fiji cruiser

so next time I confirm where I,m planning to shoot at before I get the same answer again.
New career with the VII: U-506 will take place for the sunken 505
Type IX: I just Love these boat, good size and I love the 2 After tubes.
Career with the IX : U-507
status : On patrol to Grid DO74
Ships sunk on the way : 2 T2 tankers, 1 T3 tanker and 1 liberty cargo.
so what are you favorite U-Boats?