Sim free vs Verizon iphone
The only difference is cost.
Now that we've moved into a contract-free phone era, service providers, like Verizon, will offer to let you make a payment plan instead of paying for the phone upfront. In the end, the cost is the same as the SIM-Free version, but the Verizon version only works on Verizon until they unlock it.
Conclusion: Verizon iPhones are physically the same as SIM-Free iPhones, but Verizon has more control over the Verizon model.

Bonus note:
If you are considering getting an iPhone and are on AT&amp;T or T-Mobile, the SIM-Free version will be a better deal because only the SIM-Free, Verizon, and Sprint models support CDMA, which is needed for those networks.