I've been killing Nazis in video games for over two decades, so I've become somewhat of a connoisseur. My favorite Nazis to kill are the ones in Wolfenstein: The New Order/The Old Blood, but a close second would be the Nazis in the Sniper Elite series. Rarely do games give you the chance to kill King Nazi himself, but if you pre-order Sniper Elite 4, you can kill Adolf Hitler.
Sniper Elite 3 let you kill Hitler in the "Hunt the Grey Wolf" DLC in a Nazi camp in Tobruk. This time, though, you get to hunt Herr Wolf in a U-Boat facility packed with Elite Nazi troops. It looks like there's a lot of wide-open spaces in the U-Boat base, which means plenty of opportunity for long range shots, but less cover for hiding.
If you're ready to kill Hitler, you can pre-order Sniper Elite 4 and take down the Reich when it releases February 14, 2017, on Windows, PlayStation 4, and Xbox One.