Basically the same ones for PD
"1. Transport Capacity, 2. Faster Infantry, 3. Air Transport 1&2, 4. Cheaper Infantry, 5. Lucky Infantry, 6. General's Infantry Attack, 7. General Movement, 8. Faster General 1&2, 9. Cheap Transport, 10. Safer Transport. "
from Cthulhu's guide
HERE
except I'd give more importance to cheaper infantry