Should you buy
Sergers are mainly used for edge finishing on stretchy fabrics like Knits
sewing machines can sew seams on both woven & knit fabrics
Other than straight stitches, a sewing machine has a wide range of stitches, including zigzag stitches, decorative stitches, and buttonholes.
Serger trim the fabric edge as it sews, encasing the raw edge with multiple threads - result ! A neat edge finish
Sewing machines typically use one or two threads; Sergers use multiple threads, often three or four.
Sewing machines are generally easier to learn and use; Sergers can be more complex due to their multiple threads and settings.
So what are you going to buy ? Serger or Sewing machine?
What to look for in a first sewing machine?
Should you buy a serger?
More @ sewguide.com