I've seen both types of child seats, and some shop mechanics are very, very against the ones that mount up front. They significantly effect the handling of your bike. You mentioned being able to reach your child easier - well, if you let go of the bars to do something for your child, the handling of the bike is so awkward it's just dangerous. Plus, it's much harder to securely mount them to the stem or headtube, especially on bike without a solid steerer tube.
For 3 days, I get to part of a thousand other journeys.