not true!
mage and druid can remove 1 damage off the board per turn without taking damage themselves and paladin can add 1 damage on the board, but with delay, hence worse.
hunter/warrior/priest each swing the healthtotal by 2 per turn, but after a few rounds, the added pressure of the extra minions from druid/mage will be a greater net profit.
rogue, warlock, and dh, are just straight up worse druids/mages in this scenario, so we may as well remove those.
shaman is probably the best though. 2 hp totems means that it takes a swing and a minion to kill one, so stuff like coin-totem can win you games on the spot, unless you roll the 1/1 on that. Even without that, the enemy has to keep swinging on the totems or lose, which means that your minions survive and gain the advantage over him once you roll something like the +1 damage totem once.