TomConnHello people of PMC
...or should we keep fighting for the Java version?
There's nothing to fight for. It's not going anywhere for a long time, don't worry.
With that being said though, I'm still sticking to java since it's mostly what I make content for, and it has more materials to work with as far as building goes. (Off the top of my head, Win10 doesn't have things like stained glass yet, which is a real let-down). You should still be able to build some awesome things with win10 (the trailers from E3 looked pretty nice, and there's enough that expansive maps are being sold on the marketplace, but you may run into some bumps if materials you typically like to use aren't currently there.
To my understanding, all Java users got a free access key for the win10 edition, so I'd recommend just trying it out yourself and seeing how you like it. And if it doesn't float your boat, then all you really lose is a few hours of your time, haha.