Our adco designer series is holding up very well, and trailer looks brand new. However, when I bought it 4 years ago, looking at other brands, Adco stood out as high quality. Looks like I'll get at least one, likely 2 more years out of it. so I'm happy with the performance.
Looking now, several companies have either entered the market or come out with expanded product lines. So.. If I was looking again there are others that also look impressive. One uses ripstop nylon on the top of the line instead of the non woven polyethelyne that adco and others use.
so... I'd look around, see what looks best for your use.