They both look good. Similar enough that if you wanted you could probably mix them into the same unit and it would look fine.
Individually, however, the Anvil Industry legs give off a slightly more high-tec vib. While some might really go for that, in the
40k setting and on a human, I feel it is a little misplaced (I'd give the Anvil legs to Vets and Sgts and
HQ).
The Maxmini Legs, I feel, match in better with the setting and also the armour plating of the torso.
In the end I advise going with what feels right. If you can afford it, both would be fun for the sake of variance and character
Hope that helps