Very slightly, because although I can beat Ultimate without an elixir, Ragnarok is a different story. Assuming Heart of the Apocalypse drops more frequently in Ragnarok, then the Lance is better option. Although I could get one more Sword, that means grinding for Lances in Ultimate.
The only thing you get from Ragnarok are the Cores. If you can't beat them yet, don't worry about it.
Platinum chests are extremely rare, and you might go through multiple Advent events without one. All farming is done in Ultimate.