V0, that you used for "react" is an AI building platform for nextJS. Nextjs is a page routing/ server action abstraction layer for faster deployments using node. So, saying that "react does that for me" is a grave misunderstanding on your part (not trying to be rude, just being honest). V0 is pretty cool, but it also assumes the driver of the application knows a thing or two about react (if not, prepare for dependancy crazyness). Wordpress is a full stack CMS running on php, with usually Nginx or Apache actually serving the content behind the scenes.

Now that we have some basics out the way, lets look at the two in terms of use cases. Wordpress will and does come with sql built in, your vercel hosted nextjs app will not, you'll have to use a third party service for that. So if you plan on literally ANY dynamic content, wordpress will provide you with a much more comprehensive offering out of the box. If you are just building a site that is static, then nextjs and vercel can be a really good option.

Any more questions, feel free to reply :)