All the triangular - and hexagonal - shawls I've made until now have been what I would describe as inside out. By that I mean they have started with few stitches that form the centre of the long edge and the pattern increases in two triangular panels either side of a central "spine" - as in the leaf pattern on this shawl.
But last week I made Blyth by Kitman Figueroa which works the other way. You start with the edging casting on, in this case, more than 300 stitches, and forming the shape by decreasing to create triangles on each side of the spine.
There are advantages and disadvantages of this method. Yes because each row is shorter, there is a feeling of the whole process speeding up. On the other hand with an inside out construction you set the initial lace pattern over a very few stitches and can then use preceding rows to help accurately place new pattern repeats. With the outside in approach you have to correctly place a lot of lace repeats over the 300+ stitches with nothing to refer to.
Each person will probably have their own view of which method they prefer but both produce lovely shawls so the choice may depend on what effect the designer wants from the edging.
Meanwhile my Blyth is looking great.