I have the Nansure rears with OEM fronts. I like them because they match the style of the OEM and they don't have that scooped out section which can collect snow/debris. I do wish that they were a little bit longer but to be honest, rear guards primary function is to keep from spraying the car behind you so it's less of a concern for me. The biggest factor on the rears was mostly just cosmetics and matching my fronts. The Basenor ones (and all the other similar looking chinese brands) look good but they have the scoop and the matching fronts aren't as useful since they don't sit as low as the OEM ones. Ultimately, I think the fronts should dictate what you put in the back. OEM front = Nansure rears. Basenor front = Basenor rear.
In terms of installation, the fitment was just fine on mine. Only thing to watch out for was to properly hook the top parts in behind the plastic bit - or else you'll end up with a gap. Once I got one of the two rivets in, I just shimmied the flap a little until the second hole was in line. Bonus - no need to fiddle with the rear bolt which has given many people huge problems. The push-pull rivet things they give you are fine but are really tight to get in secure (I think the center pin on these are actually meant to screw in but I just shoved them in like regular push-pulls). I ended up breaking one by trying to shove the pin in with the butt of a screwdriver but they come with two extras so no big deal.