I'm generally a heavy Chrome user, but I have not got it installed on my Surface for the very reasons mentioned above. I downloaded it once, just so I could sign in and get my bookmarks but then uninstalled it. In general I find Modern UI IE perfect for general browsing. I love the swipe feature to quickly go forwards and backwards in pages.
I do however have firefox on my surface. The reason for that is that i'm doing an online Beginners Python coding course, which requires me to run a web page "Codeskulptor" which is a java program whcih simulates python. However this does NOT work properly in IE, either version due to the fact that it uses the latest web technology which IE is not yet able to run. The web page opens but the code does not action properly and I get errors where there shouldn't be any.
Therefore if I'm using that web page I have to use firefox instead (chrome would work as well but I don't use it as I say on the Surface). It does seem strange that a company championing online, cloud first does not have a browser that can use the latest web technology!! IE still needs to catch up in some areas, but I must say, when I came back to it I was pleasantly surprised in general as I have avoided IE for so long and it wasn't as bad as I thought it'd be.