Every letter ranked from best to worst. This is about how the letters look, not how useful they are.
1. a
2. e
3. o
4. n
5. N
6. r
7. s
8. O
9. h
10. g
11. u
12. S
13. q
14. p
15. B
16. A
17. b
18. G
19. F
20. E
21. U
22. f
23. t
24. D
25. d
26. j