What are your issues with the current AC-LR? I use one of those on 1GB symmetrical internet and yes it's a big bottleneck but I'm still getting 250mbps a reasonable distance away on my old MacBook. So fast enough I probably wouldn't be able to tell the difference with a better AP for my use cases. I have lots of wireless devices on WiFi 4 and 5 as well. I do have another AP (AC-Lite) too.
Anything that uses serious bandwidth is wired in though, such as server and gaming PC. Larger downloads on those would take way longer over the AC-LR and add to congestion, so if you do that it may be worth it but I'd also say if it's not a laptop consider wiring it...
The U7 Pro XG has 6GHz, 10GbE uplink and 6 spatial streams, so looks good value (if you can get that uplink speed and give it the PoE+ it needs) although coverage metrics compared to the AC-LR are less, so you could save a bit and go U7 Long Range if you need it but you'd sacrifice features.
If I could setup again, I would probably avoid Long Range variants as my logic is they may be more difficult to not get to interfere in a domestic setting but honestly maybe not an issue and someone with more experience on deployments may be able to advise. Depends on the site too of course.