Depends what you need, Ghost rider is a very useful champ for aq, SS is a better champ for nullifying buffs and has a lot more damage potential. I love them both but I think SS is a lot more fun to play with.
Ghost Rider as a 4* is more versatile than SS. I use him every week in Map 5 AQ - my 5* r4 GR is used every week in Map 6 AQ! SS is more important for end-game players who want him for special events or AW bosses with Mystic Dispersion mastery etc etc.
Now when you say maxed out do you mean Rank 5 or 5/50? Then yes. Rank 5 that 4* Ghost Rider asap. If you mean max Signature and use stones then imho GR only needs Sig 20. Save your precious resources as you rank up and sig up other champions. Sig’ing up SS is a complicated topic I’ll save for end-game discussion.
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If GR unawakened, rank SS.
If both awakened, flip a coin really
Now when you say maxed out do you mean Rank 5 or 5/50? Then yes. Rank 5 that 4* Ghost Rider asap. If you mean max Signature and use stones then imho GR only needs Sig 20. Save your precious resources as you rank up and sig up other champions. Sig’ing up SS is a complicated topic I’ll save for end-game discussion.
Good luck!