Which url should be user- friendly?

Hey Guys! I am confuse about url structure for my new website. We are develop web and mobile app development website that website still static ( only HTML page). which kind of urls structure I can use?

please guy help me. Give me your suggestion..

For Example

/angularjs-development.html or /angularjs-development

​

or

/angularjs-development-service.html or /angularjs-development-service

submitted by /u/Rlogical_Techsoft
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