Angraecum don't give pink magic damages. Only Vervain and Chamomille can. But she works perfectly with them. Angraecum is made to be used with one of them.
I don't know who is better. Vervain based team can be the easy answer to several hard fights but is tricky to use. Sigillaria looks great, really. Reminds me the Ancient Flowers (but less broken than Zinnia or Corbett). I would say both of them are really useful.
That's a very risky bet on the future gacha but I think Sigillaria will came again sooner than Vervain. If I could only pick one, I would try Vervain and keep Sigillaria for her next gacha. But she may came really later, be outclassed during that time or we can get really good girls before that and spend even more FS on them...
There is way too many limited gacha girls and that's something I don't like at all. In the past, if you missed a girl, you could just pray to get her on regular random gacha. Or force her on special reroll gacha. But now with all thoses limited girls, if you miss them, it's dead until devs decide to bring them back, maybe in one year or more. They could remove the useless regular gacha without increased girl chance and replace it with a special gacha with only limited girls? Or just fill the limited gacha with only previous limited girls instead of regular 6*? Or just drop that limited 6* system (or maybe just keep it for very very specific girls like Ancient Flowers and special main story girls).


I don't have Tall Stewartia (Christmas) so, I don't know how good she is. I guess she is our average Crit offensive girl like Cactus, Ume, Yarrow (prison island), Dusty Miller, etc. Maybe a bit outclassed in the current meta but not trash as long as you need good crit offense.