tl;dr - Any bike commuters w/ toddlers have opinions on trailers vs. bike seats?
My wife is going back to work this fall, and DD is going into daycare. She'll be ~2.5 years old. I'll likely be doing drop off in the morning, and I bike commute. It's about 5 miles, mostly on roads (quiet ones) without bike lanes. We have an old (but structurally sound) Thule Chariot bike trailer that a neighbor gave us. In preparing for this, though, I've started to think that I might prefer using a bike seat instead.
My current thinking is that a trailer is safer if there's an incident (meaning if the bike hits the ground for whatever reason) but that it also makes such an incident more likely, by making me less nimble, wider, and less able to go off road in a pinch. At the same time, I really don't like the idea of my daughter falling from the height of a bike seat onto the road.
I'm a fairly experience bike commuter (been riding this route daily for 5 years, commuting other routes / places for about 10 years before that). I think I'm a pretty safe rider. I've never had an issue with a car, and I've had two accidents in the past 8 years. One was TOTALLY my fault (PSA time: hey kids, don't talk on the phone while riding with no hands in the dark. sometimes, there are speed bumps.) and the other was a mechanical failure (took a tumble when the crank arm broke in half).
Right now, I'm kind of leaning towards the bike seat. If I wasn't worried about it being less safe, I'd definitely go with it.
Thanks for your experience. If you need any additional info, just ask.