Agile approaches to achieve working product / application, at the end of each iteration, called sprint. V-model does not contain any iteration approach.
Agile iteration - sprint, contains every phase of software development, i.e. requirement understanding, design, coding, testing
In agile, developer, tester and customer works together on piece of code for application. V-model does not have this concept. In V-model, developer works on designing and coding and testers working on writing test cases and testing the product. There is no concept of "working together" for V-model.
Agile is more suitable for the projects where requirements change rapidly. V-model is suitable where requirement changes are almost none.
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