aerate then slit seed

If you do both, definitely aerate first. The slice seeder will place the grass seed just below the surface, where it needs to be. The aerator would then just dislocate a lot of it.
How much a lawn benefits from aeration depends on the soil/turf condition If it's compacted soil or has excessive thatch, where water has a hard time penetrating, aeration can be a big benefit. In general, if it hasn't been done in many years and you're renovating, I'd aerate.
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