The one that worked best for my bully. You are not going to get an answer to this online. Only trying the food is going to tell you what is best for your dog.
I would love to tell you my choice, but it would not be fair to all the other great choices out there. There are several foods I could recommend to you, but a lot of it has to do with what ingredients your bulldog is sensitive to. Have you checked out the dog food and nutrition section from the home page?
But, like all others said... your dog food is as unique as your dog. You might have to go through 10 brands before you find the one that works. And even then, it might work for the first 2 years, then you have to switch again...
Well ... we're using Fromm 4* and as both of my bullys are doing very well on it then I see no reason to change. However, you are going to find some people who have gone through numberous different brands trying to find out what works best for their bulldog.
It's gonna be a trial and error to find out what is going to work the best for your bully-baby .... there is unfortunately no right or wrong answer when it comes to bulldog nutrition!!!