I chose Danes because I absolutely love the berserker. The main reason melee units are weak in this game are because of their lack of movement, but with the 3 movement from the berserker you can hunt down enemy ranged unit. Additionally,it comes a tech earlier then the longsword and has the amphibious promotion, making it devastating since enemies don't have crossbowman yet when you mass your berserkers, if you do it correctly. The Norwegian Ski infantry is also good, but not very good like the berserker. The problem is rifleman are just rather poor in the game in general. But nonetheless it actually follows the SAME upgrade path as the berserker, so it keeps the amphibious promotion on upgrade. This means your norwegian ski infantry will have ocmbat advantages in hills, tundras, sea, and river, making the unit work in all combat situations. The NSI also gains double movement in hills, so it is possible to hunt down ranged units like the berserker, though, as I said before, not as efficiently. All of these units work amazingly well with denmarks free pillaging bonus. Attack, pillage twice for healing, attack again. Very powerful unit combination, I'd have to say these units have the best synergy with the ua not including the bs units lik the Keshik and Camel Archer