Which is better iPhone International version or Middle East version?

The best variant is always an iPhone from the region you live in, due to difference in cellular bands used around the globe.

Nowhere in Apple's documentation is an "International Version" mentioned, since Apple markets phones for different regions of the world.

If a seller is offering an "International Version", they are relabeling the phone themselves.

All iPhone models are world phones, so you can use them almost anywhere. Whether you are a GSM or CDMA network customer, you can roam internationally on GSM networks in over 200 countries or regions around the world. Availabilitys of LTE data varies in some countries or regions and depends on carrier support for certain LTE radio frequencies. Contact your wireless carrier for more information regarding international roaming policies and rates.

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If you do not buy Apple Care+ then...

IMPORTANT RESTRICTION FOR iPHONE, iPAD, APPLE TV AND HOMEPOD SERVICE.

Apple may restrict warranty service for iPhone, iPad, Apple TV and HomePod to the country where Apple or its Authorized Distributors originally sold the device.

Service & Support. Apple Authorised Service Providers and Online Support. Explore Service Locations. 

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