B&W or FOCAL center speakers?

What are your left/right speakers?   It is very important to match the sonic signature of all 3 front speakers.  Otherwise, it becomes very apparent that you have different sounds when sounds from movies pan across the front stage.  It also can cause problems if the center has a weaker or stronger midrange.

People always said that Bower and Wilkins have more clarity dialogue than focal. That’s what the reason maybe to try B&W

Stick with Focal.

Use room correction.

I don't know that B&W necessarily has more clarity than Focal.  However, I think the B&W has a much thicker and meatier midrange.  The focal tends to come across thin sounding (unless you very warm electronics such as McIntosh or similar). 

In my opinion, I like the sound of B&W better, but if you are considering getting a B&W center, you should also switch your left/right to B&W.