I've bought from both vendors for my 210.
Marco Rocks, and Eco Rox, are both pretty damn good stuff!!
I like diversity so this is why I wanted some of both.
Gives a nice look !
Also if you want larger pieces for larger tanks. Just write them before your order, then leave a note with your order. I asked for large pieces from both vendors and ended up with about 10 boulders total between both!
