The lighter weight trailers often give up structural integrity and amenities to save on weight for people with marginal tow vehicles.
Will you be dry camping much? Some of the trailers you're looking at may have very small tanks compared to other models. I like to be able to camp anywhere I come across with or without hookups so I tend to favor models with larger fresh, gray, black, and even propane tanks. If You intend to only stay in campgrounds with water and electric hook ups it won't matter.
Same goes for batteries. If you'll always be plugged in you only need one small, cheap battery. If you will be camping without electric look for trailers that have room for 2 or more batteries and maybe a solar option.
Personally, I'd put Jayco above many of the other brands you listed. But, they changed hands a few years ago and I don't know if their new owners are living up to their past reputation.