upgrade to Wheezy fails with aptitude

[Pierre Frenkiel <pierre.frenkiel@gmail.com>]

hi,
I wanted to upgrade from Squeeze to Wheezy, and as I saw in several places
that aptitude should be preferred to apt-get,  I first tried with it.
I started with only 1 line in sources.list:
    deb http://ftp.fr.debian.org/debian/ wheezy main contrib non-free
and tried several times  "aptitude safe-upgrade"
Each time, aptitude stayed indefinitely on "resolving dependencies" and did
nothing else.
I then issued: "apt-get dist-upgrade", and all worked perfectly, in less
than 30 minutes.

My question: is it better to also revert to apt-get for package management,
or is the problem specific to the upgrade to a new release?

regards,
--
Pierre Frenkiel