AOD's constant search mode felt more realistic to me, though I couldn't say with 100% certainty. I'm pretty sure escorts were always on the lookout for subs, rather than waiting until something happened. While Sonar/Asdic had it's limitations, there was a chance that a sub would be picked up at a range of 20 miles or more. On the other hand, a whale could be picked up and the escort might roll right over a sub on it's way to investigate the 'contact', and never no the real threat was there.
The convoy might be going six knots; the escorts could effectively 'ping' up to twelve knots, or more late in the war.
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