I can only speak from having run Ruckus R350 unleashed (2X2 Wifi-6) for a while. Compared to those the AP6 Pros are miles ahead. Range, speed, and reliability are much hither on the AP6 Pros. I also had problems with the Ruckus APs being too sticky with clients, even after tuning. Roaming was always a challenge. Wi-Fi calling never worked either. Google searching will show a lot of others having frustrations with that.
You will find the Alta team is also extremely active on this forum, and willing to listen to ideas and needs of their user base.
I can’t speak to the R510s or 610s. Maybe someone else can chime in on those.