In general, use @lisp in preference to @smalllisp

because it looks better in the DVI output.  Exceptions are

- wide examples, which would cause overfull hboxes if they
  used the bigger @lisp font

- very large examples, which may look too big at the @lisp size.

doc/ref/api-options.texi

@@ -504,9 +504,9 @@ Guile is case-sensitive by default.
 
 To make Guile case insensitive, you can type
 
-@smalllisp
+@lisp
 (read-enable 'case-insensitive)
-@end smalllisp
+@end lisp
 
 @node Printing options
 @subsubsection Printing options
@@ -719,7 +719,6 @@ backtrace.  Need to give a better example, possibly putting debugging
 option examples in a separate session.]
 @end enumerate
 
-
 @smalllisp
 guile> (define abc "hello")
 guile> abc