Best VPN for changing geolocation to access state-restricted sites

One of the better (trustworthy) VPN operators is hide.me - offering various Gateways throughput the US and further afield. An online search will find the website. There is also an App in the App store:

https://apps.apple.com/app/hide-me-vpn/id953040671

Subscription rates are generally cheaper if purchased directly from the website in preference to an in-App purchase.

There are many other VPN Operators to potentially choose from. Choose wisely - and avoid Operators that only provide "free" plans. VPN infrastructure and services cost money to run; if you are not paying a subscription, the service is being monetised in some other fashion - perhaps on mining or selling your data to third-parties.

Caveat Emptor.

That's like asking what brand of cereal is the tastiest. I suggest you should do your own research and decide what's best for YOU. Do a search for VPN discussion sites.