I don't think there is any comparison between the 2. They serve different purposes. The Alto Quilt Cut is a cutting mat with a clamping bar to hold the fabric and a built in straight edge that you can angle up to 10? different angles. You still have to use a rotary cutter so if using a rotary cutter is difficult for some reason, it's not going to be helpful for you. Another thing to remember is the
Alto Quilt Cut is heavy so if you have to move it off and on your cutting surface, it can be a pain.
The AccuQuilt Fabric Cutter systems are like the die cutting systems used by paper crafters/scrapbookers. You have to purchase a die to use for every shape you want to make then you clamp the fabric into the machine and turn the handle while it presses out the shape you selected. Like the charms from Connecting Threads only it has normal shapes like squares, rectangles & triangles in various sizes. If you are having trouble cutting those type of common shapes with a rotary cutter, this product would be very helpful. Some folks even try with varying degrees of success to use their paper crafting die cutters for fabric. The AccuQuilt is made to cut fabric.
All that being said, I have the Alto Quilt Cut and am very happy with it. I still use my regular mat & rulers a lot more often but use it for cutting scraps into strips, or squares for scrappy type projects. It makes cutting bunches of the same size blocks easier but so will the AccuQuilt if you have the particular size die you're wanting to cut.