It's different, isn't it?

Solo mining has the same expected income that pool mining over a long-enough time period. Obviously, if you have little hash power, the long-enough time period might be decades or centuries, effectively making your hash power a donation since you will never see a reward. But still, there is a chance and, when looking at the limit, reward should match pool mining.

On the other hand, zero fee routing is guaranteed to give you no income, no matter what.