There was countless, prolonged and quite-heated discussion about that issue, for example, in the link below:
It is all about your specific life environment and possibilities, access to electricity, how often you travel, ability to operate with small pieces, etc…
I have never been in Pakistan, so I am not aware what is your particular necessity.
Generally (as a rule of thumb), disposable hearing aid batteries can last over a week; rechargeable ones last, at most, one day.
If you’re a doctor with 24hrs shift, rechargeables couldn’t have enough working time one one charge.
Rechargeable HAs may have a few more features; however, it is worth noting that rechargeable battery capacity decreases after two to three years of use.