I found the demo with presets only was all about Tactics, it was easy to get a good squad. Have one doctor then balance of short and long range dudes. It was all about what you did with them, flanking, setting up your dudes(making sure they cover each other). Did you split your forces, do you lose some men to get better position, did you cover every entrance? That's what the demo was about.
The release game was all about min maxing Special Stats, Race, Traits, Tag Skills, Levels, Perks, Armour, Guns, Ammo, Drugs. Times up to 6 for a single squad. Most battles were won here.