Answer
$0.10102$ is smaller.
Work Step by Step
We have
$$ 0.10108=1.0108\times 10^{-1}, \quad 0.10102=1.0102\times 10^{-1}.$$
Since the exponents are the same and by comparing the corresponding digits, we see that $2\lt 8$, so $0.10102$ is smaller.
