The L'Oreal one has fibers in it and makes your lashes really long & thick. It holds a curl quite well. I have soft, stick-straight lashes and it even holds a curl on me, so it's good.
The Maybelline one has kind of a "wet" formula, but works well if you apply one coat, comb through with a clean, old mascara brush, and then apply a second coat. Provides length, volume and curl all in one.