Hi everyone, me think in a very few moment I would join this thread soon since I am making a Lady Lavellan to go for this most fascinating character in DA:I 
A quick question: is romancing Solas with a mage give a better dynamique compared to romancing him with a non-mage? For comparison Cullen's romance have a slightly different dynamique if you're a mage compared to non-mages. Is this also the case with Solas?
Thanks in advance! 
thers not much difference in the dialogue options, theres magge stuff you get for being a mage but thats not particularly romance related.
Now in an RP perspective, Id say it depends what story your wish to craft. A mage Lavellan is most likely in line to eventually become Keeper. So shes supposed to know a little more things then your average hunter Lavellan and it goes well with a character who is about researching the Truth. Theres a good dynamic to be had there but it can feel weird when she doesnt realize shes in the Fade, or that she cant read Elvhen in the Temple of Mythal. I feel more betrayed by the Dalish as a mage / future Keeper.
I feel hunter Lavellan has more reason to be the 'you know nothing Jonh Snow' character the game portrays the Dalish Elves to be. You got a good heart, wisdom beyond your age, but still very 'mortal' and unaware in comparaison to the big picture. Also it explains why she doesnt challenge Solas knowledge (and the game doesnt let you challenge him much while romanced (or ask questions even when unromanced) so its fitting with the actual opportunities given to us). And I feel it fits well with the romance ending, the whole starcrossed 'mortal meets god' story, where you fall in love with the man he could have been. Anyway thats just my take 
Both are worth playing for sure.
(I secretly think the ending could have been diffrent with a mage Lavellan, maybe he could have told her. But before he tells hunter Lavellan, he would have to change his stance on what the present elves are worth as a whole (them not having magic being a big point I can see him not getting on board with), which he doesnt do, yet. But it could. So much of my appreciation for this romance still hangs on what will happen next. :S )