choosing a kid trailer

I'm looking for a bike trailer for my 1 year old kid.

I had the opportunity to try a Burley Bee and and Burley Cub for a day, a they both seems not very comfortable for my son, who was not able to sleep that much.

We are planning to use it mainly for some 1 day tours and maybe once a year for a weekly trip.

We would like a trailer that can become easily a stroller, to be able to walk a bit around when we stop.

Thule ones seem awesome, but the price is a bit too high for what we have in mind.

Do you have any suggestion for a comfortable but not too expensive trailer? And also, in your experience, which are the most relevant features in a trailer?