You mean the Source Code.
First of all you need an available client and then, if you have the proper source code, you can decide with which Core you want to go to develop.
Next, after you get a stable release, you can announce the public with which version you will make a public server.
There is no reason to go with 3.0 against, 3.7 or 3.9 if you don't wish the new classes.
So, the better choice would be 3.9.
But depends which client release can you offer to be downloaded.
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