Here's why:
It looks nicer and is far more elegant.
It doesn't crash every 5 minutes
Pictures look awesome!!!
You can post multiple pictures INSIDE your post, in both a MAIN post AND a comment post
You can BOLD, ITALICS, Number and Bullet and ALIGN your text in both main post and comment post (not to mention have paragraphs in comments).
I could go on but seriously, it walks all over FB. Check THIS same text and pictures in the Forum compared to Faceache.
