pet system > free dual box imo
leveling up with help of wolves, hatchling, baby buffalo/cougr etc. i bet it could be much more fun solution for lowbies
plus even for partys. if you already have buffer, still you may want to join forces with another support if he has another pet, providing more dps in party. Also for raid bosses, right now lowbies take an eternity to kill low lv rbs.. and they usually bring high lvl buffer. support classes could provide extra dps trough pets. i think overall its more interesting. in the other hand, with free dual box if i want to start a support like wc, sws, se, i ll need to main another class (like tyr, necro) to lvl it up and without auto macros.. maybe you just want to solo wc, or tank, or healer,.. and with help of a pet every class can in his own way