Raiders on O and D because that's what I started with and by the time I thought to change I'd got used to them! TBF both books are decent.  Strategy, I have an Uncommon Pave the Way and a Rare one that applies to HB's but can't remember which one? I get a SPD boost on it though. On D I have 2 Uncommon - In the Zone and Sure Tackler. All maxed out on training obv. I'm NMS so have to build strategy cards which will take forever and limits choices obv. As I'm running a 50/50 Raiders TT I get some very good boosts, with Raiders players at the right positions getting +3 OVR.