More S!YTiki or Legendary Banner?

If you're looking for Soleil merges, the legendary banner has some great fodder units available. Kadomatsu is a really good sword, especially in a new meta where bonus units are going to need to do most of the killing. Chill Defense is available on Walhart, but even so, E!Chome has excellent skills, including Aether. L!Ryoma is a strong legendary unit, especially if you haven't merged up Fjorm. If nothing else, he has Kestral Stance and Guidance - both great skills.

Unless you're Tiki is already high enough merge to actually find a place on your arena core, I think the Legendary Red pool is the better use of orbs, considering there are far less 'devastating' pity breakers.

Yeah, unless you wanted merges for specific units, I'd look at the S!Y!Tiki banner more than the legendary banner.
Besides, loli dragon is love, loli dragon is life. Love your lolis don't lewd 'em.