It's meaningful, I think, to look at what variant of each type is the most current and wich one is the rarest.
The most current variety of 1 is 1w9 So/Sp, the rarest are 1w2 Sx/Sp and 1w2 Sx/So.
The most current variety of 2 is 2w3 So/Sx, the rarest is 2w1 Sx/Sp.
The most current variety of 3 is 3w2 So/Sp, the rarest is 3w2 Sx/So.
The most current variety of 4 is 4w3 So/Sx, the rarest is 4w5 Sp/So.
The most current variety of 5 is 5w6 Sp/So, the rarest is 5w4 Sx/So.
The most current variety of 6 is 6w5 Sp/So, the rarest is 6w5 Sx/So.
The most current variety of 7 is 7w6 So/Sx, the rarest is 7w8 Sp/So.
The most current variety of 8 is 8w9 Sp/So, the rarest is 8w7 Sx/Sp.
The most current variety of 9 is 9w8 So/Sx, the rarest is 9w8 Sx/So.
With wings:
The most current variety of 1w9 is 1w9 So/Sp, the rarest is 1w9 Sx/So.
The most current variety of 1w2 is 1w2 So/Sp, the rarest are 1w2 Sx/Sp and 1w2 Sx/So.
The most current variety of 2w1 is 2w1 So/Sx, the rarest is 2w1 Sx/Sp.
The most current variety of 2w3 is 2w3 So/Sx, the rarest is 2w3 Sp/Sx.
The most current variety of 3w2 is 3w2 So/Sp, the rarest is 3w2 Sx/So.
The most current variety of 3w4 is 3w4 Sp/Sx, the rarest is 3w4 Sp/So
The most current variety of 4w3 is 4w3 So/Sx, the rarest is 4w3 Sp/So.
The most current variety of 4w5 is 4w5 Sp/Sx, the rarest is 4w5 Sp/So.
The most current variety of 5w4 is 5w4 Sp/Sx, the rarest is 5w4 Sx/So.
The most current variety of 5w6 is 5w6 Sp/So, the rarest are 5w6 So/Sx and 5w6 Sx/So.
The most current variety of 6w5 is 6w5 Sp/So, the rarest is 6w5 Sx/So.
The most current variety of 6w7 is 6w7 So/Sx, the rarest is 6w7 Sx/So.
The most current variety of 7w6 is 7w6 So/Sx, the rarest is 7w6 Sp/So.
The most current variety of 7w8 is 7w8 So/Sx, the rarest is 7w8 Sp/So.
The most current variety of 8w7 is 8w7 Sp/So, the rarest is 8w7 Sx/Sp.
The most current variety of 8w9 is 8w9 Sp/So, the rarest is 8w9 So/Sx.
The most current variety of 9w8 is 9w8 So/Sx, the rarest is 9w8 Sx/So.
The most current variety of 9w1 is 9w1 Sp/So, the rarest are 9w1So/Sx and 9w1 Sx/Sp.