I think Mongoose had 100% uptime, but not sure if it's still the same. And still AP would be better as Berserking.
Only if you're hitting the Boss 100% of the time. If not, Berserking will be better than AP 110. Let's do maths.
Average AP of berserking:
1,2 PPM
( 337 * 15 / 60 ) * 1,2 = 101,1
OR
( 337 * 15 / 60 ) + [ 337 * ( 15 * 0,2 ) / 60 ] = 101,1
OR
( 337 * 18 / 60 ) = 101,1
its 18 cause 15 * 1,2 = 18 seconds
The cooldown should be close to this.
60 - 18 = 42 seconds
It's close to normal cooldown (45 seconds).
For pally
( 400 * 15 / 60 ) * 1,2 = 120
For warriors, due to Armored Of The Teeth, this is lower than 110. This is only good assuming you're NOT hitting all the battletime your target.
Let's talk about BloodQueen Lanathel, you're fighting the first (???) 1,5 minutes, then second phase. This means you seize Berserker at this form:
1,5 minutes = 90 seconds
[ 337 * 15 * ( 90 / 60 ) / 60 ] * 1,2 = 151,65
For 110 the ratio is less.
[ 110 * 1 + 110 * ( 30 / 60 ) ] / 2 = 82,5
Why this is correct? Because in 90 seconds you will have Berserking active entirely 2 times, this is 30 seconds of 400 AP in whole 90 seconds of first phase. The 110 Ap from the other echant is always the average, but this average is reduced if you're not hitting the Boss all the time.
Correct me someone if anything wrong (I think the first berserker in BloodQueen Lanathel battle).
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The PPM number is from Wowhead comments. You can try it in this server to know how much PPM is. The more are, the better is.