It’s far too early to call who will end up with the most users. Tom’s said that Monzo needs at least 1m users to be considered significant in the UK market.
I expect Starling launching the current accounts to the public first will generate quite a lot of press but obviously it’s going to take them a while to catch up now.
Here’s a glowy screenshot of what looks like the home page of their app &…they’re displaying your daily transactions in a pie chart 
https://www.starlingbank.com/wp-content/uploads/2017/03/homescreen01.mp4
I guess this was designed to look futuristic. I wonder what it’s like in bright light / for accessibility 
Also, it looks like there’s lots of options in their menus -
