If you’re proud of the paper, I’d highly recommend submitting the abstract.
ADcoms don’t have time to read a full paper. If they’re impressed by the abstract, they’ll request a copy of the full paper and forward it to a faculty member in the field for a full read.
Would also be prepared with a supplemental rec from the mentor/professor/advisor on the paper - if applicable.
Son applied SCEA Harvard, submitted abstract and received a request from admissions for full paper and supplemental rec. Was accepted SCEA.