GELI versus GBDE?

[Michael C Voorhis]

The Handbook contains descriptions of GELI and GBDE for encrypting
disk partitions; will both of these techniques remain available into
the future?  The fact that there are two implies (to me) that one may
be on the way out, in preference of the other.

In src/sys/geom/eli (RELENG_6) the oldest GELI sources are younger
than the youngest GBDE stuff in src/sys/geom/bde.  Is GBDE falling by
the wayside in favor of GELI?

Thanks for any information,

       Mike.