[rogihee]

I use VS2015 a lot for .Net ASP dev, but when I do Xamarin iOS dev I tend to do it in Xamarin Studio on the mac.

Much better experience, fast deploys/builds. I miss Resharper but can live without it.

[V-2]

Very recently Microsoft introduced VS for Mac (although I understand it's sort of a preview version).

I don't know about OS X, but I used Xamarin Studio on Windows and it was horrible.

[rogihee]

That is a rebranded Xamarin Studio, with a slightly updated layout to match VS.

It feels much better on mac I must say, also tried it on Windows but just weird and slow.

I'm quite happy with it, but maybe I'm biased a bit because it sucked big time and they made big improvements to it last year. It's all relative ;-).