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What is the main difference between the Maine Coon, Siberian Forest cat, and Norwegian Forest cat? I only know of small differences and I can't distinguish them easily.
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Here's a nice comparison table I found (taken from here ):

ReferenceNorwegian
Forest Cat
Maine Coon Cat Siberian
HeadEquilateral triangleWedge shaped with a square muzzle Broad, modified wedge with gentle rounded contours
Nose ProfileStraight, no breakGentle curve Nose has a slight curvature and the lower portion to the tip of the nose is concave.
EyesAlmond shapedLarge with open expression Large, almost round.
EarsOuter edge of ear
follows the line of
the head down to
the chin completing
the triangle.
Set high on the top
of the head with not
more than a ears
width apart.
Set high on the top of the head with 1 to 1 1/2 ear width apart.
BodyMedium in length,
square in the
appearance.
Long and rectangular.
LegsHind legs are higher
than front legs.
Medium in length Moderately long, slightly rear legs longer than the front legs
TailLong and flowing,
as long as the
body, circumference can reach 12" plus in
circumference.
Long and flowing, as
long as body, not
as bushy.
Wide at base, blunt at tip. Even and thick long hairs drape down from the top side of the tail.
CoatDistinctive double
coat, long guard
hairs covering a
thick wooly
undercoat.
Silky, shaggy, uneven
coat with a slight
undercoat.
Moderately long to longhaired.
RuffWhen cat matures, a
profuse ruff develops
around the neck.
Moderate frontal ruff
around the neck.
Abundant
Mature Size/AgeUp to 15 pounds,
Females age 3
(7-10 lbs.)
Males age 4.
(10-15 lbs.)
Up to 20 pounds,
Females smaller,
Males larger.
Not given


There's also this interesting drawing (taken from here ):

Comments  
the main thing in their looks is that the Maine Coon has long ear tufts and as far as I know is the only domesticated breed with them (current me if I'm wrong, I don't have any other breed that comes to mind atm) . The Maine coon is also bigger. The main thing though is something that most people wouldn't be able to tell unless they know the breed very well which is differences in the face (eyes, noes, head, profile) and body shape, it's like finding the difference between a Korat and a Russian blue, unless you are really familiar with how their face usually looks most people wouldn't be able to tell the difference.
Thanks! Emotion: smile
 Prada's reply was promoted to an answer.
nice! thanks a lot Prada! Emotion: smile
You're welcome, I'm always glad to help if I can.
Pixie bobs and American bobtail s both have earned tufts.

Hi, I would like to adopt this cat and would like to know what is his closest breed (it was found in the streets so it might be either a pure breed who escaped and never found/ or was left on the road, or a mixed breed). Thanks!

https://www.facebook.com/animalwelfaregozo/photos/pcb.415075132182073/415074658848787/?type=3&the...

Please please can anybody help me? I've always had Persians and have recently lost my Jasper to liver cancer. Am looking for a kitten. However, during ten years since my last kitten, the persian breed has become SO FLAT FACED and "typey" due to GCCF rules. Therefore I've been told to consider Norwegian Forest or Siberian cats. Want a brown tabby male. Prices hugely higher than ten years ago.... OK, everything goes up.... But have a provisional booking on sweet brown tabby male Norwegian Forest.... Yet feel unsettled as the mature cat looks very leonine and majestic, but haughty.... Siberian cats seem to have the dip in their noses that traditional and open faced persian kittens USED to have. Am nervous to switch breeds from what I know but intuitively believe the Siberian is half way between the flat nosed persian and Norwegian Forest cats..... A costly mistake to live with if i make a mistake...... Desire cuteness of traditional open faced persian yet not keen on leonine look of adult Norwegian Forest cats........ Is a Siberian the compromise?