China Mobile HK v CSL one2free??

So, thinking about one2free for them.  Recently I've found the one2free service (especially in my workplace) lacking.

My thinking is that I will get CMHK service (have been CMHK previously and thought they had pretty decent service), but with the pccw mobile backbone (as pccw supply CMHK with their 3G network), that way I avoid the excellent CS of pccw (something which I would prefer to avoid).

CMHK's pricing is very competitive, and much better than the others.

Thoughts?

Or will I be getting much of the same, as the providers are all pretty much the same (mind you if I'm getting the same service, wouldn't it be better to go with a cheaper provider in such instances?)