Wasn't Ginger Cell stronger than Future Androids too?
Not necessarily. I think present androids > future androids. The Super Saiyans were closing the gap them but I don't think they were quite there yet.
A pamphlet says Imperfect Cell has more power than Goku, essentially implying Gingertown Cell. Not much to compare him to the future androids besides that.
Vegeta might be equal to Future 18 based on Trunks mistakenly thinking they were matched, before he knew the present androids were more powerful than his.
Based on a bunch, since weighted Piccolo's power rivals present 17 and 18, I'd say Gingertown Cell rivals future 17 and 18. I'd put Gingertown Cell around perhaps 2/3 present 17, give or take.