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Wicc described everything accurately. This issue has been thoroughly investigated. If someone were to actually compile all the information and create a database of skill trees to accurately determine the best upgrades, that person would deserve a lot of respect. However, it's worth noting that this is a Sisyphean task because the practical benefit in an actual game is minimal (no more than using a damage calculator). It's better to spend the time that would be needed to analyze all the skill trees on improving your gameplay skills. You'll get more benefit from that.
There was a debate here about Craig and Nimue. They have different skill trees. But Claudius and Tamika, or Shakti and Dasa, have the same 255 skill trees.
P.S.: Using the program is, of course, a cheat, albeit not a very serious one. But the program DOES NOT WORK online. The author has fixed this.