I’ve got a 2019 with the 12" screen and UC4 (don’t think the screen really matters). Mine works quite well overall, not perfect, but solid. I recently ran a trip across 8 states and didn’t have a single issue. I prefer the built-in system because it’s always there and designed for the truck. No messing with a handheld or some awkward mount and tiny screen.
I also have a 2025 Jeep GC with UC5. Haven’t put as many miles on it yet, but it seems to be working well so far. My usual approach is to zoom out first and confirm the route makes sense, tweak if needed, then let it run. After that, I can keep whatever I want on the main screen (audio, phone, etc.) and still get directions in the center cluster.
I don’t really need turn-by-turn most of the time, but I do like seeing distance to destination. To each their own...