For all PS4 users, the PS4 is set to sleep Bluetooth devices with no activity after a few minutes. So typing with Bluetooth keyboards, you will usually notice a delay when first typing if you haven't used it in a few minutes. I highly suggest a wired keyboard. Also, not all Bluetooth keyboards are compatible with PS4 (though MOST are compatible).

As for the controller keyboard attachments, I used those when I first started playing this game and didn't like them at all because the buttons were so small. Then I went to Bluetooth keyboard because I had a spare lying around, but I just couldn't get use to the delay especially when I'm running dungeons and trying to type. Now I use a wired keyboard for my PS4 for chat and I love that setup. But if you do want wireless because of the hassle of wires, then you'll just have to get use to the delay for PS4.