I recently ordered the parts and am switching to a water-fed system from an all bottle system.
The bottles, while less likely for a severe flood, need filled every 2-3 days. A bucket with a water feed system can last a week or better. For me it's about time management and filling 15+ water bottles every 3 days is way more work than filling a bucket every week.
Depends on your colony I suppose but I've surpassed the number of bottles I want to fill regularly :)