With battles now effective in version 2.0 the game became quite challenging as players have now other options. Most players before v2 are racing for upgrades to produce more resources. The announcement 2 days before v2 triggered the great majority to focus more on troop building. We should expect that more units are being trained daily and storage houses became one of the most focused building for upgrades. In my personal experience it is very inefficient to battle and it doesn't matter whether you're attacking or defending. Most of the time, the plundered resources are not nearly enough to compensate for the resources used to train the units lost during attacks.
Rowdy, the unsung hero
Rowdy although have low attack and defense also have some advantages as a unit. Number one of course is that it's very cheap, for 600 resources it's cheaper than super bouncer by 4.5 times. It's faster than bazooka guy and mercenary which are the two hardest hitters in the game. If you have another account, you could send 1 Rowdy to attack your main account every 12 hours providing you shield most of the time. It will do almost no damage having very low stats. Well, this tactic doesn't have any flaw because after the shield went down again you'll need several minutes to send another Rowdy. In that span of time an attacker can take the initiative to attack you with faster units like ninjas, knifers etc. I do not recommend sending ninjas and other strong units with decent speed to attack your main account as an alternative to rowdy, these units can kill a few of your weaker troops. The choice is still yours anyway, if you're being targeted by huge players with thousands of troops then sending 1 ninja every 12 hours should still be worth it if you calculate potential losses.