Incorrect question...
To give a proper answer, I need to know: 1) the size of the map on which the game will be played, 2) the map template that will be used (or if it's random and there's no template), 3) the difficulty level, 4) how battles with monsters are planned – whether it will be quick battles or normal battles, and what the time limit per turn will be. 5) Also, it matters how well the player asking the question knows how to play with a particular faction (some factions are very strong, but you need to know how to play them effectively. If a player doesn't like a particular faction or isn't good at playing with it, but is very skilled at playing with another faction, then they should choose their favorite faction, not the objectively strongest one).