I've generally been content with Mobilink, but - you don't get Zong signals in your room, whilst I don't get many operators signals in my room
That said, I have this weird OCD to conduct network searches and measure the dB reading in random places. I'm in Islamabad Club, and whilst Zong has 3G here, Mobilink falls back on EDGE (haven't checked it today, but this was the case a few weeks back).
In fact, let me try and check!
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Edit: yep. It's still weak. I think their site is placed in another angle. The room I tested in was just outside their hi-tea and library (the corridor near the exit), and the signals are weaker for Mobilink.
Point proved: their strengths may vary in terms of coverage, but it's the majority of the areas which I'm interested in. I could dig up other black holes as well, but that's not the point. The point is - how is their coverage on a grander scheme of things? Cause Zong's is very good... As a whole.
Edit 2: some numbers:
Zong: -85dB
Mobilink: -103dB