Visual Studio was first released in 1997, the company has 20 years experience in designing and building tooling. I believe they also have a very firm dogfooding policy, and some very intelligent people work there.
Google changed the search engine landscape and created the only competitor to the iPhone, but building tools and tooling is definitely not a key strength.
There are some incredibly annoying basic missing features in Chrome dev tools. Like you still can't just hover over a variable, you inexplicably need to highlight it. Functionality that IE dev toolbar had 10 years ago. And don't even get me started on their shitty black boxing solution, something that should be as easy as right clicking on the file you want to black box, but no, time for some bloody regex foo.
It's better than Firefox + IE, by it's not better than proper IDEs by a long shot. And it's got "designed by a programmer" written all over it, the UX is awful.
VS has the 'immediate window' which allows you to execute (almost) any statement within the context of the local scope, including intellisense and autocomplete.
I'm curious about Xamarin. I've been weary of cross platform tools since the days of trying to use phone gap but I understand the current gen of tools are much better.
But, no joke, it's a BETTER experience than Android Studio. I had a much better time using Xamarin Studio (on OS X) and Visual Studio with Xamarin (on Windows) than I ever did with Android Studio. And not just because of the tools: C# provides so many great features that make Android development awesome on it. And the API is essentially the same as the true Android Java API; I found myself googling "start an activity on Android" rather than "Xamarin start an activity on Android" because it's all done the same way.
I normally don't obsess about my code looking clean and beautiful, but when I wrote my simple app in C# it shorter and easier to read than when I did it in the Android Studio.