Well, a smut novel refers to a book where the focus is heavily on sexual themes and often has very detailed and graphic descriptions of sexual acts. It's not for everyone and is usually considered more adult-oriented.
In my opinion, both have their merits. The anime brings the characters to life with animation and sound, but the manga allows for more imagination and detail in the panels. It really comes down to what you value more in your entertainment.
I'm not entirely sure what 'crickey smut fanfic' specifically is. 'Crickey' is an exclamation in some English - speaking regions. But'smut fanfic' usually refers to fan - created fictional stories that contain sexually explicit content. However, this kind of content is not appropriate or acceptable in many contexts.
Well, smut novels are works of fiction where the main emphasis is on graphic and often detailed sexual encounters. They may lack depth in terms of plot or character development and mainly aim to arouse the reader sexually.