Depends solely on what your favorite way of riding is.
Some like to be ok powered and have lift for tacks, and enjoy the awesome angle to the wind.
I like to make narrow carves and jibes, not be very powered, and to be able to ride any course without getting overpowered by apparent wind.
So using an UL foil kite in the lowest wind as a necessity, but as soon as it gets to 7 knots of wind I use a LEI instead.
Maybe in a bit higher winds a foil kite starts to work again as these turns fast now - I hear many using the Peak 4 in this.
I use my smaller wavekites in this, so I dont need two sets of quivers.
But if you only hydrofoil it wouldnt matter