Hi,
that depends by your budget, if you can afford a GoPro Hero 5 black then buy it, even with basic settings you can make videos with great quality, also it has an integrated LCD touchscreen so you can see what you are recording without using the GoPro app. If you want to spend less, you can buy a GoPro Hero 4 silver still for the integrated LCD. If you want to spend even less, you can choose the Gopro Hero+ LCD still for the LCD.
If you want to shoot decent 4k, and i suppose you want the best image quality since you work in a publisher company, you must choose between the Hero 4 black, Hero 5 black and Hero 5 session. If you want to shoot in 1080p you can take any recent GoPro, just keep in mind the image quality and the framerate.
Keep in mind that this is an italian forum, but i hope i helped you
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