Play on Classic difficulty. Ignore everyone those who say to play Tactician.
They think their way is the only possible way to play and they have literally no concept that not everyone is as skilled or knowledgeable about how to min-max and exploit as effectively as they do. They do not understand that anyone else could possibly find Tactician frustrating.
(I haven't even tried Tactician and I have no interest in trying it in its current poorly-executed state.)
The reason for playing on Classic is incredibly simple: If you are one of those people who find out that Tactician is too difficult for you, whether at the start or later on, there is no way to change the difficulty lower. That means you'll need to start all over again. At least on Classic if you find things too easy you can increase the difficulty.