It's more featured, and is released under a license that's not restrictive. Consider using it as a replacement for MySQL, and if you're a good guy add support for PostgreSQL when you write something that's to use with MySQL.
If 1.3.4 is really a stable release you should update it to ftp://ftp.gnu.org/gnu/libtool/ and not to ftp://alpha.gnu.org/gnu/libtool/. Doing this I'm pretty sure people will continue using 1.3.3. From the site: "The latest official alpha release is available for testing from alpha.gnu.org or one of its mirrors..