2.8 and 2.9 version have similar options ensure your completely new to alternative software; you can start with any version. I’ve started with the older version; Blender 2.79 to get comfortable with the tools and curve and then moved to the latest version 2.8
Blender has done a completely change regarding the tools and a more improved interface is way different. In the versions your wanting to choose I would start with Blender 2.8 first to get the ropes and comfortable with the workflow and tools.
A lot of changes that been made are the same in both versions it’s just they updated the UI and change the tools and move things around in certain areas. Whatever version you choose I would recommend learning and searching tutorials to get a hang of the tools and interface all it takes is just practice.