Reiter
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Well, Brona, I think everyone chooses that at the beginning; 7 basilisks are always a good choice.
+ Double moat in the castle.
- One archer, and even that's barely noticeable, since it's level 2. An elemental of Storm or an Arbalester, even the same Arcomage, is stronger...
+- Earth - swamp; it's difficult for everyone to move around, for you and your enemies, but it's worse for the enemies, especially if they're from a different castle.
I've played with vitalic so many times, and he always chooses Tazar :D The terrain penalty is undoubtedly a plus. You move at full speed, while the opponent moves at about 60% speed. It's certainly a difficult way to play, which is why many people don't even try it. But if you level up Tazar and get him the Sphere of Inhibition (I often found it on random maps), it will be very difficult to compete with him...