Trust me friends this question has no answer.

Because its all depend on your luck and your purpose of using too.

A good smartphone should have these specification

1st MINIMUM 2GB OF RAM OR 16GB OF ROM

2nd MINIMUM 2 GHTS

3rd MINIMUM 2800 MAH BATTERY

4th MINIMUM 5MP FRONT AND 12 OR 13 MP BACK CAMS

5th MINIMUM 5 INCH HD SCREEN

6th OS should be Android bcz maximum apps supports on it than any other OS like IOS/WINDOWS

7th should have 4g sim slot and expandable 32gb sd card.

8th WIFI and Hotspot

yes I'm telling you a good smartphone not best smartphone

Because koi bhi phone ko aap full day use kroge toh battery problems over heating problems etc ati rhegi

for example agar aap bohot der tk chalane k baad ise charge krte h or turant chalane lgte h toh battery and touch screen k lye ye bohot dangerous toh h hi or kbhi kbhi explode hone ka bhi chance hota h

so mera mean toh aap smjh hi gae hoge jitna apko rest ki zarurt h utna hi apke smartphone ko bhi tbhi vo ek good smartphone ban skta hai

I hope u all will follow jo kuch bhi mne btaya