There were serious problems in 2019 with ARM and also with NV2. Those have clearly been solved. Saying that one of the protocols is better than the other today is not always correct. http://forum.mikrotik.com/t/best-point-to-point-protocol/145926/2
My current experience ( 5 SXT sa5 ac and 15 SXTsq ac) on one 1km2 area, 100+ client devices, have made me switch all of the SXT AP’s to NV2 for best performance. 40MHz channels, driving 20 hAP ac2 and 15 wAP ac. Surrounded by quite some interfering long-range AP’s. It’'s by experimenting over a year, and I’m not alone in this forum in 2021 with similar outcome.
Nv2 saved this setup, but any other area might give different results. Test and compare.