Overlock or coverstitch machine: which to choose for knits and garments?

What does Serger do best?

• It closes and finishes the seams.

• Work the edges to prevent fraying.

• It makes the inside of the piece look like it came from a "store."
  (An overlock machine is a type of sewing machine focused on sewing and edge finishing.)

What the recoating machine does best

• elastic hems (T-shirts, sportswear)

• Double stitching on the outside with elasticity.

• Clean finish on the meshes.

Difference in 1 sentence (so you don't get lost)

Overlock = to construct/finish seams and edges.
Recobridora = elastic hems and topstitching

When is it worth buying?

Buy an overlock machine if:

• I sew clothes frequently.

• You work with knits and want a quick and durable finish.

Purchase a recoating machine if:

• Do you do a lot of hemming on knit fabrics?

• You want a "professional" finish on the visible edges.

Alternatives (if you still don't want to invest)

• elastic stitches on a domestic sewing machine

• double needle (for some hems)

• Zigzag or overcast stitch finishes (if applicable)

FAQ

Do I need both?
Only if you sew clothes regularly (especially knits). For occasional hobby work, start with a domestic sewing machine + a serger (and see if you miss having a coverstitch machine).