Certainly because TG is geared toward reusing already existing
components. In TG you'll be able to choose your templating engine,
your orm and in TG2 any WSGI component you want.
In Django you'll have to use their orm, their templating
engine...(partially false I know but yet... the primary focus is not
on reusing outside components)
This is just an outsider (tortuga-wise) POV and is obviously biased
toward TG since I am a core TG developer :)
If you just think in terms of volume (as opposed to quantity) you'll
be moving to Php or Java instead of Python. If you think in different
terms (the complete definition of those would be lengthy and subject
to speculation) you'll choose Python. (grin)
Florent.