They both have similar lifespans. The SSD is much faster, but it's more expensive per GB. If you can live with 240 GB's of storage, I would just use a an SSD, since it's about the same price as a 1 TB HDD. Then you can always add another HDD if you find you need more storage.
https://pcpartpicker.com/products/compare/rwcMnQ,7v38TW,BNGj4D/