So in my Post, I have mentioned almost all the Points you have mentioned in your Comment.

I have Discussed the Budget which is the most important Factor.

As per the Purpose of the Phone nowadays Mid-tier to flagship grade Smartphones are built in such a way that they are Gaming capable plus have high RAM. It is also said that if you are buying a Gaming Phone you are basically buying a Flagship. Take the Razer Phone for Example.

As per the GPU, it comes bundled with the Chipset so it doesn't​ matter what GPU you prefer it will be secondary to the CPU.

As for Display settings, ​anything around 400 PPI is good and I did not mention it because almost no one is going to notice​ the difference unless you have High sensitive Eyes.

Lastly you said ---

With a ​limited budget you will never be able to buy the best smartphone if you are stuck with top n expensive brands.

Yes, ​its kind of true when you will go towards the Mid Tier range you will have to make some compromises when it comes to certain aspects of the Smartphone you want to buy.

For example, ​my One Plus 5T is not Splash proof so I had to compromise on that factor especially bcoz my previous Phone was water resistant.

You have to compromise a Bit.