Which champ from the list of Must Awaken & Max Sig Champs is best option to save 6* Sig Stones For?

MaxLee

As we all know 6* Sig stones are still very rare and high value so which champ would be best to save sig stones considering that Champ WILL HAVE VALUE & USAGE ACROSS ALL CONTENT IN THE LONG TERM.

Ethereality

Aegon or CAIW