I live in the US. so i can't speak to the region limitations.
even with power limitations, the AX86U has more 2.4 ghz antennas. this allows it to channel the available energy in one direction with more antennas. this will allow for better range in a given direction.
the pro has a faster...
I have the Asus RT-AX86U Pro. The 2.4 ghz range is significantly better than my old RT-AX58U. Like you, i found the range of the 58U lacking. with the 86U Pro, the range is much, much better.