Ask the Hunter com over at the us blizz forums, They strongly disagree with this. The hunter can no longer counter the frost mage, actually the frost mage wil farm the hunter like a npc.
Your comparission is true for MoP not WoD and its current patch.
Actually i suggest a mage out of alle these wizards. The mage has many tools to win 1vs1, you just need to be prepared. In addition the mage is now the best choice for 3vs3 and 2vs2. RMD is everywhere at high ratings, RM is still powerful in 2s and its a pure dd comb.(pretty fun).
mages are fluently to play without cluncky meachanics too and there is no ramp up time, just use your cds properly.
i played mages and locks since BC - i know the time in s2-s4 in BC and early wotlk when mages were farmed by locks and had very little mana bars and need to mange this mana bar with lower rank spells. Especially fire was drained just after 1 kill in bgs.
Now, every ape can play mage and be successful with him, u bascily play a rogue with ranged abilities, you will not be hit. Actually mages can only be truly countered if 2 agressive dds stick on him to lock him down, or 1 really good dk which is basicly a wizard slayer class.
mages are the most played dd in 3s for a reasion, i assure you its not the rogue why rmd or rm was and is strong, he only does his little peeling and interrupts and thats enough for the mage to hit the opponents team like a truck and this, while frost mages are now considered cc machines and affliction locks damage bots.
That said - locks are probably more interesting to play(for longer amount of time), as you can basicly play all 3 specs in duels and have high success depending on the opponent's spec and if the dude is prepared.
If you want quick duells i rather would use the mage, though. since locks have ramp up time.
We are talking about real prepared veteran duels and not just casual ones, i hope?