The Guhong and the Zanchi are two very good cubes, they are also two completely different feeling cubes and some may prefer one to the other because of this. Cubers who like smooth cubes would like the Guhong while people who like fast cubes would like the Zanchi. Each have their pros and cons but it really boils down to the solving style.
Personally I prefer smooth cubes, my main is the Guhong. The Fangshi Shuang Ren is a really good smooth cube as well. I recently got the Shengshou Aurora and it is incredibly smooth, I'm considering making it my main. Visit bestspeedcube.com
, it has cube comparisons of the best speed cubes you can get.