[Nemo]

I suppose I could also see this as a viable alternate Worlds alliance strategy:

One robot races for two green cans, and the other two robots race for one can each, then all three robots make capped stacks.

The alliance leaves the yellow totes behind the alliance wall, opening up a bit of field room while forfeiting those 20 points in favor of winning or tying the green can race more reliably.

Edit: To answer the original question, I think the most in demand robot will be a landfill stacker that also grabs two recycle cans in auto. Essentially I agree with exactly what Eric said above.