I finally managed to snag an iPhone X from the Apple store 2 weeks ago when I saw they had stock. I'm on AT&T, but I waited for stock at Apple specifically to get the Verizon model because of the Qualcomm modem. I didn't do it for better speeds, I was already satisfied with the speeds the iPhone 7 was capable of, but instead I did it because of the better power efficiency of the modem in low signal areas and overall reports of the previous models (7 and 8) handling poor signals better on the Qualcomm modem.
I work in a building that is basically a dead zone for AT&T, where my cell signal goes between 1 bar and no service throughout the day. When I had the iPhone 6, I could get away with charging my phone every other day but with the 7 I had to charge every day and over 30% of my battery drain was due to "No Cell Coverage" according to the battery monitor in settings. I know the iPhone X has a bigger battery than the 7 and this could be contributing to the improvement, but now I'm only seeing roughly 20% of my battery drain due to bad coverage in a day and I only have to charge the phone every other day.
Overall I'm happy that I waited to snag a Qualcomm one instead of pre-ordering and being forced into the AT&T model.
I know my co-workers with Verizon get good reception at work, but the only reason I haven't switched is because I'm grandfathered into an old AT&T unlimited plan which is still cheaper than Verizon's current unlimited plan. And I'd prefer to switch to T-Mobile instead because of their better prices, but they don't get reception where I live despite their coverage map saying otherwise. (I have an iPad with their free data plan that I use to check coverage occasionally, and most of my friends have T-Mobile and they don't get service when they come here)