I'm human and done with ch 17, to give my perspective. In early tourney rounds and through most of the spire, I use all the barracks troops. Yes, even the barbarian and mortar, but I very rarely built those two. When the barbarian begin to fail, I usually switch to dogs. From the training camp, I train dogs the most, orc strats 2nd (but have many grounds of orc strats) , and dryads a bit. Never orc warriors. I just don't use them. I prefer using blossom mages against HM instead of the dryads. The merc. camp is my fav. I train everything except drone riders. I use blossom mages and rangers the most, but also use a good number of frogs. Lizards I use the least (ok drone riders are almost never used) but since I have many hot tubs (Vallorian Valor) I don't usually train them.
People have asked me why I use blossom mages instead of priests in the higher provs and rounds. Blossom mages have a higher initiative than priests so get to fire earlier in the rounds than the priest would. Also, they have a higher attack value against most opponents. These are valuable assets and can win the battle without the opponent taking a single shot more often than the priest do. However, they are more fragile than the priests and there are cases when it's better to have the enemy move first. When a round of survival is required and/or it's better to let the enemy move closer, priest become the better choice. But, like I said at the beginning, all the barracks troops work nicely in the easier battles which lets me save the mercenaries for the tougher battles, especially when it gets to the point I'm going to fight manually.
Although it's rare that I use banshees, they are cool in a manual battle with the sound on. They screech the enemy to death and make an awesomely loud sound when they die. Definitely the loudest troop around. You may want to turn the sound level down when you use them. Well, maybe worth having it loud the 1st time you use them.