Hi,
I had this very same dilemma a month ago. I owned the Zeiss Touit prime lenses for landscape work but I was asked to do a few weddings and couldn't cope with continually changing lenses. So, I sold my 12mm and 32mm lenses and bought the Fuji 16-55mm. But I still wanted a super wide for landscapes. I thought about buying the 14mm or the 10-24mm. I was so used to using the Zeiss 12mm that I thought 14mm wouldn't be wide enough. After much thought and review reading, I bought a used 10-24mm in mint condition. My concern about switching from a prime to a zoom was put to rest once I started using the lens. It is a great lens. Distortion is very low and details are crystal clear. I had thought that 10mm was too extreme and I thought I would use mainly the 12-16mm focal lengths but most of the time it has been 10mm that gets used. My advise would be go for the zoom. Like me, once you have used the 10mm focal length, you will be so glad that you have that option on your camera. You just need to watch out for you feet appearing at the bottom of the frame!
Good luck with your decision.
Cheers
Paul