The community is smaller and as Konrad said, is less regulated in terms of "selection." You could possibly benefit from the option that there is not such influx of products + backlink.
Didn't know Uneed, just checked it, looks like a Product Hunt clone with fewer features, fewer products and a smaller audience. It seems the advantage of Uneed is that it's completely democratic, without featured products selected by the staff.
Yeah for sure, ProductHunt has a bigger community which means more exposure but also more competition for attention. Uneed could be a good option to get some early traction and feedback with less noise. Depends on your product and goals but worth checking out as an alternative or complement to PH. Let us know how it goes!
minimalist phone: creating folders