mimom-a serger makes home made clothes have a more "professional" finish to them.
bpieces-are you planning on using the serger for quilting? Personally speaking, I consider it more for clothes making than quilting, but I have heard of people using them for quilting. I would image that using it, you would have a much bulkier seam allowance.
I have an much older Babylok, which is a real work horse and don't use it as much as I once did, but there's no way I would sell it.