For someone who has a Windows 8.1 device (laptop) as well as a Surface Pro, are there any unique features of the Windows 8 phone that would create a more unified experience between all of the devices? Are there any ways that a Windows Phone would interact seemlessly with these existing devices more than an Android or iPhone would? 

I am not looking for the virtues of WP8 versus WP7 or Android or Apple, but rather any beneficial factors which arise from having a Windows phone device rather than something else.