wcs2228
2
I had a Slate AX (before I gave it to my son for his condo) and I still have a Slate Plus. Except for being a bit larger, heavier and maybe using more power, my opinion is that the Slate AX is superior is every way over the Slate Plus.
Both routers were released only this year and run Firmware 4. The Slate AX being released a few months earlier, the firmware may be a bit more mature after some releases. It is hard to gauge longevity when they are both so new. I recommend sticking with the GL.iNet firmware as there will be new releases for these new products, which should have all the functionality you need, based on your post. Otherwise, you will be on your own with vanilla OpenWRT.
I do not work for and I am not directly associated with GL.iNet