A serger can not do what the standard thread injector can do. With a standard machine you can sew baffles on the interior of a quilt. That is not possible with a serger. At best the stitches would be wrong for the application creating a bulk that would be undesirable. At worst, the cutting blades of the serger could not be disabled and you would end up slicing your your quilt into nice smooth strips that are sewn together. If you can only have one machine... opt for a traditional sewing machine. If you want to splurge and add another machine to your arsenal go for the serger. But for the money you are better off using the traditional machine over the serger.