I'm glad you're interested in Magento platform.
There are huge differences between Community and Enterprise editions, but the core is the same. So, depending on your extension, you might have to do some additional work for client which are using Magento Enterprise (to solve compatibility with full page cache, for example).
Also, keep in mind that Magento released version 2.x one year and a half ago, so it might be better for you to start with Magento 2.x immediately.
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