The best utility trailer is one you can afford and will use.

Personally, I think the Bikes at Work trailers are far superior to the Nomad or those of similar designs. The only trailers that may be in the same league as BAW is perhaps the Surly Bill and Ted or Black Oak Fabrications. Though, I've never seen either of the latter in person, only read about them.

I have the BAW 64A and have hauled dozens of loads on it. I've had bins of sand or soil, bins full of glass/plastic to haul to the recycle center, metal for recycling, odds and ends to go to the second hand store, etc. Other than the fact that it's heavy duty, I like the fact that it's designed around the ubiquitous Rubbermaid bin - 4 fit perfectly across the bottom. With lids any items in the bins will be protected from the weather, and an additional second row can be stacked on top of the bottom row.

The downside to the BAW trailers is they're expensive ~$500. However, I've made $200 in the past 9 months recycling metal. I've also saved numerous trips by car or truck to the recycle center, the second hand store, etc. Mine will pay for itself within a few years. My last metal recycle trip included a 300 pound wood stove. I would not have been able to haul that in a lighter-duty trailer, so my BAW made it possible to transport it by bike.

I have a cheap child trailer that's now converted to a smaller, light duty utility hauler. Sometimes I attach it to the back of my BAW trailer so I have even more room to haul things. While I've not used a Burley Nomad, my trailer is one of the dozens of cheap konock-offs, so I have experience pulling a similar trailer. It has been good to me, but doesn't even come close to my BAW trailer in terms of sturdiness and load capability (both volume and weight).

I have numerous pictures and descriptions of hauls in the What Utility Rides/Trips/hauls/errands did you do today? thread.