
Slightly lower attack, slightly higher defense (+/-5%)
Higher chances for spells and magic. Lower chances for logistics and machines.
Access to the center perk is through spells, not machines.

Added 1 minute ago
I came across a strange mod that changes the interface to a style reminiscent of Heroes of Might and Magic III. Perhaps the author of this thread will find it interesting. The mod is posted on VKontakte, and it's impossible to identify the author.
https://m.vk.com/wall-55167960_1223
I took a look; it's an interesting creative endeavor by the author, but the vanilla adventure map menu is still better =)