If you wanna be a crazy person, you could always buy a long USB cord, attach the adapter to that, and string it along your floor next to your controller for some wired/wireless gaming. Assuming the PS4 controller is a Class 3 or at best a Class 2 Bluetooth device, the max you can get is about 30 feet, and I assume you're getting significant decreases in performance as you approach that limit. PS I'm looking at the Bluetooth Wikipedia page, looking at maximum range and drop-off.

Then again, I'm playing at my desktop, a maximum of 5 feet away. I just stuck it into a front panel port and it's been excellent ever since. The only issue I've encountered is that, when it's behind my desktop and my monitor, I was getting shitty ping times and lag due to either interference or visual contact (though Bluetooth doesn't use IR-esque directional connection, so I don't know). I guess you should go for USB 3.0 no reason not to.

As long as you're not getting cheap Chinese knock-offs, any variations will be negligible. The ASUS USB-BT400 provides new and advanced Bluetooth 4.0 and enables wireless connectivity with a wide range of devices such as computers, printers, phones, headsets, speakers, keyboards, controllers, and more. Honestly, I don't think there's much of a difference. Asus USB-BT400 Nano Bluetooth Stick (use PS4 and Xbox One controller on PC, Bluetooth 4.0) Product Description The USB-BT400 is a Bluetooth Smart Ready USB.

Asus usb bt400 ps4