Which qwerty dual sim phone should I buy? or should I buy only dual sim phone and not qwerty??

Hello and Welcome to FixYa!
Sir, It depends on your other requirements as well.
Here is a list of Dual-SIM Phones with qwerty: Link
Here is a list of Dual-SIM Phones without qwerty: Link
You can click and see all the specs of the phone you like.

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Concerned, Nooh