Fix what can be fixed, patch what can't. That being said, I go OL. If we use some FA money and our high draft pick, the OL is complete. Once the line it's fixed, our defense becomes instantly better through sustained drives, time of possession and points scored. Points scored alone allows Fangio to blitz a little more than we have seen.
Now that the offense is fixed, spend the rest of the draft and FA on defenders and TE.