And that's why RealMe is the bad option. Doesn't even have 300 ppi.
Comparing the two shortlisted devices, Samsung M30s and Redmi Note 8, I think following are worth nothing:
> Redmi Note 8 have Gorilla Glass, which Samsung probably don't have
> But Samsung have AMOLED display

> Redmi have Infrared, which still have some uses
> Redmi have 18 watt charger, and since battery is 4000 mAH, it will of course charge way faster
> Camera sample on gsmarena compares better in Samsung M30s, which probably due to the difference in f/stop number (since mega pixel is the same)
Anyone of them would probably be worthy upgrade from Samsung J2

Compare Samsung Galaxy M30s vs. Xiaomi Redmi Note 8 vs. Samsung Galaxy J2 - GSMArena.com