Her durability is a factor that I find uncertain. Outside of attics like in Feeling Pinkie Keen and discounting her alicorn power boost, all I could find in my brief searching was this one time where she took a beam in the face from chrystalous in the comics. Actually that in is itself is pretty good, such in the panel before it shows those same beams hitting and scorching the ground and sense she was firing in such rapid secession you couldn't argue that Twilight was being hit by a weaker bolt to stun her... but you could possibly find something else in the canon that could conflict with this. Twilight would have to relay on her magic to defend herself and I'm not sure how well her magic barriers would rate (the ones in season 5). Her larger shield might do better but at a possible expense of maneuverability. TK and fir' her laser I think would do better at interception of attacks. or at least I've found better evidence for when I looked around.
As for Raven's abilities since I am unfamiliar with the universe and so I'm just doing with what I could find by briefly skimming through list of her powers and watching a few fights on YT (along with some VS and who is the most powerful of X debates). So anything I could say could be even more off. I've seen things attributing such things as her being a magic user who knows a few spells of her own. She has at least decent TK, which apparently she doesn't use as often in one of the comic cannons. May or may not be able to resist changes in the time, summon daemons, creat nightmares, etc. which may or maynot be able to one KO TS... (She once apparent took out an army of 3000 daemons from her dad) Though personally I think it will come down to two factors : her powers from Trigon and her empathy powers... this is where it could lead to somewhere interesting.
then again, I also saw her shadow form being held back by rock hands, so for all I know, TS could just hold her down and that's that
