No personal preference here but some advice. First, look at the frame height. That will tell you how rigid the trailer will be. A 4" frame is fine for a single axle but awful for two axles due to flex. Whatever you end up with, make sure you get and take a video of the pre delivery inspection. No question is silly and if the person giving the pdi won't/can't answer a question, do not proceed with the inspection until someone can give you an answer. It would also be helpful if you had someone who was familiar with travel trailers along with you for the pdi.
Be aware that perfect trailers right out of the factory are as rare as hens teeth. A good prep crew will take care of issues before you get there but there will always be something either at the pdi or after. Minor issues after delivery are best when done by you as even something minor like a bad shade can put your unit on a dealers lot for months at a time. This is one hobby that can make a handyperson out of you or use your skills to do better than the designers.
Some info on OSB: it is used in most high end homes due to the inherent stability.
Never let the small stuff ruin a trip.