Feel at Home
One of my absolute RTS favorites and an overall PC game favorite of all time is the Homeworld franchise. 16 years after its original release Gearbox has put together an HD version of the first and third installment of the franchise (HW1 & HW2). The UI is overhauled and they have made a few other tweaks as well. The HW1 is now running on the HW2 engine and next to everything looks better, shinier and more at "home" than back in the day for a modern gamer with demands on graphics and physics. If you never picked this one up you really should give it a go. It's fun and has a lot of atmosphere, and it's totally 3D. You can manoeuvre from up, down and not just in an isometric kind of way. You'll find it on Steam.