I have learned over time that a small kite makes it easier to generate apparent wind with its speed, and I prefer it to large ones and their muscles generating power.
I have a Soul 10, and I have sailed in 10kn with a TT 139x39. I would think that with a 12 you can lower two knots plus the range ... maybe with a 15m reach the 7kn.
But with a TT, I would not like to fight in the water trying to relaunch a fallen kite. And less be semi-submerged with a 19m. I prefer boy and fast, that big and powerful.
Now, with the pansh that I have tried, I noticed some things
If they work, but not with the precision of a high-end kite.
Sometimes the mixer or flanges come badly set, the materials are of low or medium quality. And this causes the fatigue of material to appear more quickly.
Fly, yes. I enjoyed them, yes. but there is a sea of difference ... almost as big as the price.