Realme, Oppo, Vivo and One Plus all have one parent company BBK Electronics.
Quality of Realme is equal to Oppo from opinions of mobile sellers, forum and video reviews.
Realme 5 is the lowest priced Snapdragon 665 powered device currently in market (Oppo A9 2020 with same chipset is priced around 45000) yet it offers more than expected at the price point, 5000mah battery, 6.5" display (even A9 is 720p+), 4 Camera Array
I was eyeing realme 3 pro as it was for 34/36k (128GB, 4 / 6 GB) but it became short (probably as supply stopped in anticipation of realme 5 and 5 pro) and prices rose to 40-44k.
I bought a box open Y9 Prime 2019 but returned it the next day as it didn't feel as solid. there were hints of unoptimized software or chipset and front camera mechanism was flimsy. (The reason I avoided F11 pro)
All I need is a reliable device (I already have Oppo A57 and F11, brother has F5, friends using almost all models of the F series) and, on both hardware can take hits and software is rock solid, no app crashes, no reboots required for months only if sim is changed) with more storage.
Color OS has me hooked, not to everyone's liking and may have a quite different feature set than typical samsung or vanilla android phone but it suits me more than EMUI and MIUI (closest similar ROMS)
Color OS 6 has App drawer both on Realme and Oppo phones
Now I'm deciding between Realme 5 128/4 (Rs. 32000) or A5 2020 128/4 (Rs. 35000)
I'm more inclined toward A5 2020 as it has a better design (same as A9 2020, Less flashy color scheme, camera array is concealed that they don't feel more than a dual camera)
Flagship grade audio (Stereo Speakers, Dolby Atmos, HiRes DAC)
Maybe a 19, 20 difference in quality as I haven't handled a realme device myself but I'm confident on Oppo.