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In general, all the maps are completely different, each has its own advantages and disadvantages. You need to think carefully about which one is the best.
Among the single-player maps, I would highlight the "Illusion of Victory" map. It's a very original map where even an ally is, in a sense, an enemy. More details:
I only found out on the seventh day that the task was to destroy the monastery within a week (I wasn't paying close enough attention). I started over. I went the wrong way and ended up who knows where. I started over. Fortunately, I found Logistics, otherwise I wouldn't have made it. I didn't suffer any losses because I used Devils and Dungeon Lords in battles. They have good health so they wouldn't die from minor enemies. As soon as I destroyed the monastery, I was completely confused about where to go and where to get troops. I had to make do with what was available. The mines followed the same pattern: first, I captured them, then a few days later, blue came and took them back, and a few days later, yellow came and captured them. In the end, most of the mines belonged to yellow by the time I destroyed two cities. I finally got to the Dungeon and found decent troops for myself. While I was completing quests with Shio, blue came back again and started taking everything. In the end, they and yellow were playing tag all over the surface. I didn't bother accumulating troops, and went for the third city. I took the garrison without any problems, but the city itself was well-guarded. The autobattle gave me a victory with heavy losses, and I agreed, expecting that now everything would be fine, but no! Now I had to deal with a demon with a considerable army. I decided to take a risk and teleported to the Inferno city, bought everything I could, and the next day intercepted Marbas on the road. The battle was tough, and I won on the third try! I won the battle thanks to the Cave Lords. And then, with a cup of coffee, I watched Alaric crawl towards the castle for 5 days. The graphics are excellent, and I didn't notice any bugs. The level of neutral creatures could be slightly increased, as well as the enemy's. I was constantly on edge and expecting some kind of trick. I even thought that I would have to defeat Orlando, but it didn't happen. Huge thanks to the author for the map. My vote in the Single-Player Map nomination goes to Illusion of Victory