Well, I'd really love to try for Minerva, and I can probably scrounge up 20 orbs by Sunday if I get the 10th stratum fliers quest done. But holy crap Caeda is absolutely worthless, I should've leveled Palla instead even leaving her at 3*. I've watched her lose 1v1 to green armor units, and she has a freaking armorslayer. She simply cannot beat any green axe 1v1 except Arthur. She's not terrible against mages, but going into 10th stratum with an all melee team when they have magic users is a gamble because if Reinhardt or Cecilia are there you're 100% fucked.
Caeda is pretty bad with her default set honestly. Interestingly though, I ended up doing a few calculations with her, and while it takes work she is pretty much the best red flyer at the moment if you are willing to do it. I'll assume 5* Caeda and a flyer team, since it makes the most sense.
5* Caeda neutral stats: 36/25/37/24/34
Buffs: Goad Flyers (+4 Attack/Speed) x2 (Because if you are running a flyers team, this would be the minimum you should have)
Caeda's attack after buffs and weapon: 25+12 + 8 = 45
Caeda's Speed after buffs: 37 + 8 = 45
At this point, she'll be doubling basically always, and actually has a reasonable attack stat. Of course, this does assume a flyer team, and she really is only good with one. If we want to push her further...
Above Caeda with Silver Sword + = 48 attack, 45 speed
Above Caeda with Brave Sword + = 41 attack, 40 speed
Mind you, we haven't even given her any skills, so she is still without a B slot, special and is running darting blow in her A slot. If you are willing to invest in her, give her desperation and an attack buff -> either Death blow or Life or Death
SS Caeda with Deathblow and Desperation = 48 attack + 6, 45 speed (doubles everything 40 speed and below)
SS Caeda with Life or Death and Desperation = 53 attack + 50 speed (double everything 45 speed and below)
BS Caeda with Deathblow and Desperation = 41 attack + 6, 40 speed (quads everything 35 speed and below)
BS Caeda with Life or Death and Desperation = 46 attack and 45 speed (quads everything 40 speed and below)
Default weapon Caeda with Deathblow and Desperation = 45 attack + 6, 45 speed (doubles everything 40 speed and below)
Default weapon Caeda with Life and death and Desperation = 50 attack, 50 speed (doubles everything 45 speed and below)
So, while she may rely on being on a flyer team, she is actually pretty good. Same idea as Quadsuna really, just applied to a flyer. Keep her C skill and she will also make a excellent partner with a tanky flyer (Michalis, hey!). For comparison:
Neutral Cordelia's stat line: 40/35/35/22/25
Buffs: Goad Flyers (+4 Attack/Speed) x2 (Because if you are running a flyers team, this would be the minimum you should have)
Cordelia's attack with Brave Lance + and buffs: 35 +8 + 8 = 51
Cordelia's speed with buffs: 38
Cordelia's stats with Life and Death: 56 attack, 43 speed.
So, she isn't too different from Cordelia, and is arguably better depending on your needs. Of course, this is dependent on your ability to put together a flyer team (need at least 2 Pallas for this) and you need to put some investment into Caeda. Caeda still prefers a +attack nature, bumping her attack up 4 points, and at her best she is a bit better than Cordelia, for a lot more investment. Up to you, but I wouldn't count her out. Really, she just has terrible skills for her stat line (and bad attack, but we can fix that).