Hmm I would say the main one is that FreeSWICH is there now, and has been around for some years now.
Asterisk SCF is a project, not very advanced it seems.
If you can afford to wait 2 or 3 years...:)
Probably the most technically visibile difference (other than FreeSWITCH is here now) is that Asterisk SCF aims to follow a distributed model (components run in different processes or even different machines).
Moises Silva Senior Software Engineer Sangoma Technologies Inc. | 100 Renfrew Drive, Suite 100, Markham ON L3R 9R6 Canada t. 1 905 474 1990 x128 | e. moy@sangoma.com