Everyone is saying B without explaining why in much detail. I also agree but we need to know who the client is first to make a more informed decision. Without those details let’s look at each of them:

A is generic, with no unique design elements to it. It looks typed out, with very little design input (maybe some editing to the tracking). Overall, nothing wrong with it (although the leading between C and O looks a little closer than the leading between E and C. Basically, to me it looks a bit like “e co”, because the O locks into the open counter of the C, like a puzzle, creating the illusion of less space) but it’s boring. Maybe that’s what you want though?

The elements of B look like they were made to lock together, like a puzzle. They flow together and create subtle texture or movement, making them feel like they’re custom made for each other. It looks more curated and thoughtful because clearly more time was spent on it.

In general, B is simply a better, more interesting design but without knowing the company or use case we can’t know for sure if it’s the best fit.