For me it's not a matter of Warden, Hawke or Inquisitor but of which Warden, which Hawke and which Inquisitor.
Favourite: City Elf (Tabris) and Commoner Dwarf (Brosca) Wardens and Dalish Inquisitor (Lavellan)
These three were the characters I grew to care for. It helped, I think, that the wardens, especially the city elf, were feisty little ****** who got on just fine with Morrigan and Zevran and that so much of the content of Inquisition revolves around elven lore.
With a pretty self-serving rogue very few interactions with my favourite companions felt forced in DA:O, neither in the original nor in Awakening; for me that was a huge plus.
And in Inquisition, even though I initially walked into the game with the idea that I wanted to romance Cullen, I found this homely elf being all cute and polite so I thought 'Well, why not? I can always romance Cullen on my next playthrough. This older scholarly dude looks like a nice, safe romance option.'... so yeah... god-kisses and heartbreak. And I'm finishing my third playthrough now, over 500 hours invested in the game, and it's 3 out of 3 elves
... all suckered by the ****** wolf... because Cassandra and Dorian won't return my affections 
But I'm slooowly working on my lady Cadash... because Bull needs a woman too. 
Least favourite: Noble Human Warden (Cousland) and Aggressive Hawke. I wanted to like them, I did... I think I have up to 30 hours on my warrior Cousland who was supposed to be Alistair's queen and at least 200 hours in DAII divided between 5-6 non-diplomatic Hawkes (of which only one mage finished the game) but I never really bonded with any of those. Only green Hawke and (occasionally) sarcastic Hawke said things which matched something I might say in a given situation... aggressive Hawke, to me, came accross as having... issues.
Side note: If I could have played Fenris instead of Hawke in DAII I think that would have made the game for me... elven ex-slave with epic tats which help him rip someone's heart out of their chest becomes Champion and Viscount of Kirkwall and has a rivalmance with his Dalish blood-mage companion... yes please.