In 19/29 without a doubt Hunter is the best class. Most Classes don’t have much in the terms of gap closers at this point and in the 29 bracket you can do the Big Game Hunter quest chain at level 28 (with help from a level 60) to get yourself Master Hunter’s Rifle which has an ilevel of 43 and will help you pull off some massive crits with Aimed Shot.
Hunter is S tier in both brackets.
In the 19 bracket:
-Mages do not have blink
-Rogues do not have crippling poison or stun lock combo.
-Warriors have Hamstring and Charge but no intercept
-Shamans do not have Frost Shock
-Warlocks have fear but you can out range it (No death coil) also no succubus or Fel hunter
-Paladins have HoJ but have to be close to use it
-Druid don’t have travel form , feral charge or increased movement in cat form.