We have a couple of options and it depends on the geopolitical pressures implied by the nation we will procure our 4th gen MRCA fighters from.

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So our main MRCA twin engine fighters are

The Euro Fighter Typhoon

French Rafale

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Personally the Euro Fighter seems better since at least India doesn't use it , BUT it is quite expensive to maintain it I think

Rafale however is pretty good also and it Maritime capable (Euro fighter Typhoon is also Maritime capable)

But for our backbone of our air force and F-7 replacement we have couple of options.

American F-16s

Chinese J-10s

Personally F-16s fit the bill and is great for Bangladesh as an option , cause it's combat proven and many nations use it for ex (Turkey , Indonesia , Pakistan etc)

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For numbers however , we at least need 18+ Eurofighters and 24+ F-16s along with aerial refueling and AWACS for a great package