As others have said it all comes down to the quality of the installation. Board fencing is the same though a lot easier to put up IME.
I would not want to use an installer that does not have a fair bit of experience installing it. We all learn from our mistakes, lack of attention to some detail. I don’t like “paying” for my mistakes and or learning curve but I hate paying for someone else’s education. I’ve been around the block a few times so it is pretty hard for someone to BS me about their experience.
When hiring a contractor I would want references of others they have installed for.
I have helped install this type of fencing for some friends. I found it to be a total PITA and a bit of slow going and a lot more expensive than installing Oak board.
Contrary to the propaganda put out by the manufactures IMO and experience it is not more “safe” than a properly installed Oak board fence. If a horse is going to go through a fence it is going to go through a fence. One way or another. A 1,200 pound horse running full tilt carries a lot of kinetic forces. If it hits near a post it will snap easily, the “rails” can and will “zipper” and the horse can get wrapped up in it. Or as has happened at a couple of farms I know the horse flips over it. 2 walked away with minor injury 1 broke his neck. Another one who snapped the post got wrapped up in the “rails”.
IME a horse that runs through a wood fence just the board break and “blow” out. We have a lot of horses behind 2 and 4 board oak. Over the years we’ve only had a few “break outs” none with any issues other than minor scrapes. Board fence is very simple to repair. We have never had a horse get its legs under and get trapped. Sure, there are exceptions to the norm just like plastic.
“Plastic” has its place for sure. But if I were located in an area that has easy access to Oak board I would never consider anything else. My farm is a lot bigger and diverse in scope than the average person on COTH. So I have a different way of looking at things. I couldn’t imagine having to power wash all of my fencing from time to time.
Personally I would never use white anyway. Studies have shown horses don’t see white very well from a distance. They “react” to the color after getting close to it. They see brown much better. And around here with our weather conditions white would be a maintenance hassle.
For my operation and horses I would never install “flex rail” fencing on the outside of the post. Too easy for young horses, some horses in general to “knock knees” on the post and or injury a shoulder. Seen it happen.