Why not two ferals? there is a couple of reasons.

1 I want both a tank and healer and some clue how to play them, single boxing instances.

2. when I started them I was leveling a mele(rogue) + healer (spriest) the concepet work really well (though that was single boxing with one of my kids). The druids were started so I could mess about after bed time.

3. I am more of a casual player vs hard core so having the always in demand tank and healer in the inventory will get me into pugs easier than my hunter.

4. with Multiplicity and no special key bindings a melee and caster is quite easy to manage. Just move the mouse between the screens and the controls switch.