Rath is 26 and got the ride on the horse I suspect, because his wealthy mother in law bought into the horse.
Gal has been riding internationally for years and routinely recieves 10 for the rider score.
It's a good schoolmaster for Rath, but to my eye it looks as if he is getting far less out of the horse and does not have the co-ordination of aids to keep the horse collected enough, and in front of the aids.
Although his hands are nice, they are not always giving at the right time. As a result the horse is not as active behind as he is with Gal. There are also a few "misfires" with Rath where the horse is breaking gait - they are also happening with Gal but he is diffusing the horse and keeping him better in tempo when it is happening, and keeping the neck longer during the tense moments. When Rath is in the ring for the first while the neck is just getting short where as Gal has the strength and timing to hold the horse back mainly with his seat (seen in the first few seconds of the KWPN HOTY video when Toto spooks while Gal is half halting to piaffe).
Still, if Rath gets the timing figured out and stops breaking gait it will be a hard pair to beat. It will be interesting to see what happens when they attend their first competition...