I make chunky salsa in 2 quart batches. I have terrible knife skills, it takes me way too long to dice the amount of tomatoes needed for a batch. I am looking for a piece of equipment that will chop or dice the tomatoes into appox. 1/4 inch pieces in a quick and efficient manner.
Working as a cook myself... unless you really like chunky I would go with a blender. Issue with a blender about half the tomatoes will be a purree before you get rid of all the big chunks and if you start cutting up the tomatoes it wont take all that much longer just to dice em..
Blender quick but half will be a purree ? Dicing all of it will be nice even dice but takes longer. Which is more important nice and chunky or speed?
I cut the things in thick slices and put them through a french fry cutter. That gives me nice tomato cubes without much hassle.
Incidentally, the cutter works great on peppers, bell etc, too; nice square bits, little effort; plus of course you can make french fries or cottage fries.
I have something similar to this. The size of the pieces it chops into just depends on how long you run it - the longer you run it, the smaller the pieces.