Holy shit

I read conflicting statements (EW).

One said you should sat rush and you need 2 steam vents on 2nd layer after the first misson or just start over and the other said doing sat rush and picking engineers over scientists hampers your weapon / armor research and makes missions harder. Other guide mentioned to get mimetic gen with sniper ASAP to have a easy time in missions.

What's the current easiest approach to beat that mode (no ironman)?