Before any extra feature matters, a feed tool has to turn your catalog into the shape each channel expects: required attributes on every item, GTIN and brand carried through from the product record, availability and price refreshed often enough to match the storefront, and a category mapped to the destination taxonomy rather than guessed at.
Both platforms handle this with a rules layer between the store and the channel, so storefront copy stays written for shoppers while the feed carries the phrasing shopping surfaces match against. The same rules earn their keep in either tool: build titles from brand, product type, key attribute and size, fill colour and material gaps from tags or metafields, drop items with no stock or no image, and stamp custom labels for margin band and season so campaigns can be split on them later.
If your feed problems are disapprovals, missing attributes and titles nobody would search for, both tools solve them. The choice then comes down to what else you need in the same place.