I've been on Nikon FF since 2014. Up until last year, I used a Rokinon 14/2.8 for the extreme wide end, alongside a Nikon 18-35G for the standard wide range. The Rokinon is a fantastic value at $250-300 new, but comes with a big caveat: their QC is not up to first party standards. Like, not even close. I had to return two copies before receiving one that wasn't decentered (i.e., the left edge's focus point would be noticeably closer than the right, or vice-versa). If you can get a good copy, it will have you covered for any structure shot you could want, and is sharp almost to the corners at f/5.6. Even though my Nikon 18-35G had slightly better color/contrast and was lighter in weight, I didn't find myself using it all that often when 14 mm was an option.
Last year, I moved to the infamous Nikon 14-24G, which is neither cheap nor ergonomic. Its IQ is pretty much unmatched for a zoom covering that range, though. Although it goes for $1700-2000 new, I was pretty easily able to find one used in great shape for $900. My thought is that if you buy used at such a discount, it's almost like a rental, in that you'll be able to sell it later for only a small loss (if any).
Between the two wide-angle setups I've chased with, I'd recommend the 14-24G, so long as you can deal with the weight and bulk. The main reason is to have a single lens covering the entire "structure range" so that you never miss shots swapping back and forth, a situation that plagued me on a few occasions.