Honest about the overlap
Both put a list of destinations behind one URL and count the clicks. Most of the difference is presentation and free-tier limits, not capability.
Compare the free tiers against your actual link count rather than against a feature list.
The one real divergence
Loyalty. Stamp cards, member records and a counter scanner are a different product bolted to the same page, and only a business with repeat in-person customers has any use for them.