Confused? Don't worry: you're surely not alone in that. Last year's console was something of a half-step measure designed to appeal to new 4K TV-buyers, but the Xbox One X is a properly premium upgrade, packing in a huge amount of added processing power to drive smoother, better-looking, native-4K games.
But what if you already have an Xbox One? And more pressingly, what if you've just purchased an Xbox One S, whether it was an upgrade or your first of the bunch? Well, then your decision is a lot tougher, since the Xbox One X has a whole lot in common with the other versions.
Need the latest info? Here's our early take on whether you should bother picking up the Xbox One X this November if you already have either Xbox One.
Xbox One: The original Xbox One was a big, bulky-looking rectangle that certainly lacked style but packed in power. And even with the size, it had an external power brick that you'd need to keep nearby. We much preferred the slimmer original PS4 design.
Xbox One S: Now here's an improvement: The Xbox One S trimmed down the console's footprint dramatically while adding a bit of flair to the design with the dotted grill. And better yet, the power supply is built right into the box. Fantastic.
Xbox One X: The Xbox One X seems to split the difference between the two previous editions. Rather than a mostly flat face, however, the top half juts out on the One X, and the dotted design is less prominent. It's also black, like the standard Xbox One model. However, Microsoft says it's the smallest Xbox ever built, so it must have shed a tiny bit of size from the S.
Verdict: We would never advise trading in a still-recent console for a slightly different one just because of how it looks. At first glance, the Xbox One S is still our favourite of the bunch, but this isn't really a critical consideration when we're talking about an upgrade.
Should you upgrade from Xbox One? No!
Should you upgrade from Xbox One S? No!
Xbox One: It's almost four years old now, but the Xbox One is still pumping out solidly impressive graphics today and remains roughly on par with the PlayStation 4 in overall performance. It has an octa-core CPU at 1.75GHz, an 853 Mhz GPU with 12 compute units and 1.3 teraflops of performance, and 8GB RAM.
Xbox One S: Honestly, there isn't a big difference with the Xbox One S over the original: the GPU is bumped up to 914 Mhz to help with the 4K upscaling, and it can make for improved frame rates or added effects in games, but there's no significant distance between them.
Xbox One X: Well, here's where things get interesting. The Xbox One X makes a big leap in terms of performance capabilities, with an octa-core 2.3 Ghz CPU, a 1.172 Ghz GPU with 40 compute units and a whopping six teraflops of output, and 12GB RAM.
Verdict: The Xbox One X can push more detailed-looking games at native 4K resolution at potentially 60 frames per second, depending on game, and it'll certainly beat the PlayStation 4 Pro (which does 4.2 teraflops) to be the most powerful console out today. If you need the best of the best, then yes, this is where the Xbox One X shows its worth.
Should you upgrade from Xbox One? Yes!
Should you upgrade from Xbox One S? Yes!
Xbox One: Whether it's a game, Blu-ray movie, or streaming video, the Xbox One tops out at 1080p Full HD resolution. That looks pretty crisp, admittedly, and most people probably have a 1080p TV in their homes, but it's hardly the gold standard.
Xbox One S: With a minor processing upgrade, the Xbox One S is able to display 4K media from both streaming services and Ultra HD Blu-ray discs, and it can also upscale games and any other 1080p content to run at 4K resolution. Upscaling doesn't look quite as clean as native 4K resolution, where the extra pixels are already packed into the content, but you'll see the added crispness if you have a 4K TV. And it'll do high dynamic range (HDR) lighting too.
Xbox One X: Forget upscaling: the Xbox One X has enough horsepower to display many games natively in 4K resolution and at 60 frames per second too (with HDR, as well). And 4K media, either streaming or on a UHD Blu-ray, will certainly be no problem for this monster.
Verdict: Do you have a 4K television? If so, do you want games and media to look as great as they can on it? In that case, yes, you'll definitely want to upgrade to the Xbox One X. However, if you have an Xbox One S already, the move from upscaled 4K to native 4K might not be enough to warrant your immediate £449 (RM2425) investment - especially if you use the Xbox for media more than games.
Should you upgrade from Xbox One? Yes!
Should you upgrade from Xbox One S? Maybe!