K1 aero or B-MAX4 III

[hardijs]

Looking for 1/10 4wd buggy... at our track many drives 22-4 and xb4, but I wish to be different, so looking for other top brand buggy.
So now at top of my list are two K1 aero and B-MAX4 III... nobody drive those cars at my country, so asking for advice abouth those two - strong and weak sides?
Intend to drive modified class- at small, tight carpet track, as well at outdoor rough and low grip track which is build and used mainly for 1/8 scale buggies.

The main answers I wish to find to following questions:
1. Durability?
2. Performance on carpet and outdoors low grip?