There are some very good sharp pinking shears on the market with ergonomic handles, Fiskars is one of them. For me, when I prewash I use the pinking rotary blade for my ergonomic rotary cutter when I have a sharp one on hand, and I snip off the corners of each piece of fabric. I wash several yards of fabric at a time so running the rotary along the edges goes quickly. Next to no shredding of the fabric when washed. I don't load the washer with too many fabrics. The fabric needs to be washed and rinsed thoroughly and that cannot happen if the fabric cannot move in the machine. I have witnessed a couple of people overload the washers to save time but it doesn't really save anything because then you could be stuck pulling those fabrics apart and dealing with a tangled mess. To answer your question-if you can afford it, have both on hand as you will find both are beneficial.