I meant tie in the sense of a match rather than of a split vote

I wouldn't say London's is by far better than Edinburgh's in fact I think they are really evenly-matched and in the end comes down to whether one prefers a relatively old, functional exhibit, or a new aesthetically-pleasing and themed exhibit. I am in the latter category of people, possibly owing to my age but also to my tastes (for example, I like Beauval a lot).
Fair enough on the viewing, it's a tight one - not really a point in either zoo's favour.
As for the pumping areas, I selected the 'Base Camp' (the house in the bottom left) with theming and educational material, the viewing deck, and then the penguin area behind it, although I will concede that I did include a small keeper area which is only around 10 square metres at most, but if it bothers you I will subtract that area from my claimed exhibit footprint. However, I still maintain I missed off a good portion of viewing so that should make up for it.
I have indeed seen Edinburgh's exhibit, although I must admit not to the same level as you have seen London's. I saw it on my visit to Edinburgh and then the Cairngorms in 2014. So you win on that count, although I haven't made any claims about Edinburgh's exhibit apart from texture to be fair.
For those who can visualize such measurements and volumes, the London zoo Penguin pool is 1200 square metres in size and contains 450,000 litres of water. If it helps, this is around half the volume of water in Nuremberg or Burger's manatee pools.