I always think of those as the "big 3" manufacturers. Everyone has their favorite (or dislike), often based on some past experience. They are all similar price points and similar quality. Each is capable of turning out a lemon or a great unit and with RVs in this range it's a roll of the dice which one you get.
From reading experiences on RV message boards over the years I'd rank them as Jayco first, Keystone next and FR last but it's pretty close between them. And fwiw I own a FR product and it's been a decent unit.
As others have said, go to a show or some dealers to find out which ones you like best. Also, all 3 manufacturers have great websites with floor plans and specs to look over.
