Of the three, Crack the Case has the highest resource potential and the ability to support your allies, at the cost of not being always available when you need it. Burning the Midnight Oil is more reliable and only asks that you be able to make a basic investigate action, which any Seeker should be able to do. Where does that leave Cryptic Writings?
Cryptic Writings will far less reliably give resources actionlessly (especially at lower XP), but it does have icons. This means if you don't need the resources, you can simply treat it as a skill card , and it makes for good Crystallizer of Dreams fodder for Ursula and Trish. With a bit of XP, seekers will draw far more cards on their turns than during Upkeep so its reliability in coughing up resources will improve. It also has a slight edge in speed over Crack the Case or Burning the Midnight Oil it'll due to not having to wait for the right timing, again assuming you can reliably draw it on your turn.
If you're running Higher Education, you'll most likely be looking at one or both of the other cards. If you're running a heavy card draw or cycle engine, Cryptic Writings could merit a second glance, although most likely Astounding Revelation would be all the resource you need unless you're hoarding cash for some reason or have really good resource sinks not named Higher Education.