You have a good reason to consider the ecosystem, esp if you use icloud at all (everyone who is part of it usually does). There are options to do everything on windows, but it will take some adjusting (esp if you swap everything).
My setup: Surface pro 2, Lumia 1020, windows 7 desktop
For work I have a Mac book Pro and just don't care for the OS, I just Remote to my windows PC. It runs excellent on process mgmt, never lags...but the OSx is not something I personally enjoy.
iOS is an excellent stable OS much like its parent, but the UI and system are a bore for me. I started with a 3G, greatest thing at its time..to 5S which was cool...but no, sorry still too the same for me...so I'm back on WP8.
I've got an Xbox one as well, use the Xbox one smartglass app...and if upload needed OneDrive. It all works well, but still different from osX.
IPhone 6 will have a bigger screen, if that will satisfy theb id say to wait for the reveal before making a decision because the leaks point to a S3 size? My 2 cents.
Me? I'm very satisfied with Windows devices, there's room for work but I believe they may be finally on the right track...however only time will tell