We have the Vista and while its great for us living in a small rural town where I don't use public transport much, it really wouldn't be my first choice if I was living in London. Nor would the Cruz, it's still too big and bulky. I chose the Vista with the thought in mind I would also get a lightweight maclaren option fairly early-ish, so for me the qualities of the Vista are a bit of a counter balance (as no one pushchair is perfect). I loved the carrycot and used it for daytime naps/ overnight when away, the mattress is breathable. The shopping basket it massive and very useful as I walk to the supermarket. And it's wheels are sturdy enough to cope with some roughish ground for country walks, although nothing too off road! I did appreciate having it in parent facing mode for longer too. All things which my lightweight maclaren lacked.
Those are the main positives, the biggest negative is that it is so WIDE. I knew this when I bought it and it was a pay off I was prepared to take, another owner I've met hadn't realised this and it was so frustrating for her she sold it and bought a different one. I even measured our front and back door frames to check it'll fit through, I'd suggest you'd do the same as ours only just fits. It's a good 10cm or more wider than a lot of models and living in London I think you'd really notice.
I really liked the height of the Vista, both in that it holds the baby higher and for my comfort (as you may have guessed I'm an average height, while my dh is a fair bit taller). But my ds won't sleep in it anymore when out and about unlike in the maclaren, I wonder if the height and being able to see more makes a difference.
My friend has the baby jogger and loves it, it really suits her needs (her dh is also tall). It wouldn't have been for me as I really wanted the overnight-able carrycot and preferred the parent facing option.
The cruz wasn't out over here when I bought my vista so haven't looked at it in detail. I wasn't impressed when I saw it in the shop though despite being curious (I had wondered if it would have been a better option than the Vista (NO!)). 2kg lighter still makes it a heavy pushchair, would you be getting a lightweight option later on or will you be lugging it around while on holiday/ days out etc? (Think steps.... lots of steps!)
Woah I've written an essay - sorry! My last point would be that another friend and her (v) tall husband really rate their chameleon.