Games : Are Zookas and Riflemen Equivalent?

In Boom Beach, I'm trying to figure out the balancing between Zookas and Riflemen. Yes, Zookas are substantially higher in damage, but bear with me:

Riflemen stats (level 12):

• Health: 295


• DPS: 71


• Size: 1

Zooka stats (level 12):

• Health: 126


• DPS: 228


• Size: 2

So, by this logic, in a single attack with 6 barges of size 14, you can have 84 riflemen (at 5954 aggregate DPS, and 24780 total hit points), or 42 zookas (at 9576 aggregate DPS, but only 5292 total hit points).

Another way to think about it is that every rifleman can get hit essentially twice (vs once for a a Zooka), so they can shoot twice as many times.