The iPhone 8 and X models are the first iPhones to support fast charging and wireless charging, but given how fantastic the battery life is on these new iPhones, I wouldn't recommend a fast charger; they're expensive solutions for a problem you won't really have with the iPhone X. On average, I end each day with about 60% left on my iPhone's battery, so I personally don't have occasions where I need to quickly charge my phone.
Wireless chargers, though, are totally worth your money: Since your phone will almost certainly make it through a full day, you just place your iPhone X on a charging pad when you're ready to go to sleep, and by the time you wake up, it'll be fully charged. Or, you can put the phone down for a few minutes and pick it back up whenever you need. It's a much more fluid and elegant solution compared to continually unplugging and replugging your phone into a Lightning connector.
As for a specific charger, I would highly recommend buying Belkin's BoostUp wireless charging pad for iPhone X and iPhone 8 and 8 Plus. Belkin was kind enough to let me borrow a review unit and I'm thrilled with the product: It's simple, looks beautiful, and works effortlessly. You just plug a into a socket, connect the cord to the charging pad that rests on your table or nightstand, and you're all set! Just place your iPhone on the pad (in any orientation, just in the middle), and it'll start charging. It works instantly, feels very futuristic to use, and makes the iPhone X feel like a more complete experience.
If you'd like another option to compare, my colleague Steven Tweedie is a big fan of Samsung's wireless charging pad, which can also prop up your iPhone X at an angle on your nightstand.