I have used wide bars (44 cm c-t-c) and narrow bars (38 cm c-t-c), and thought that I liked the wide ones better. Then after riding last winter on my wide-set modernized Fuji Royale, I began riding a narrower set of randonneur bars on my touring bike. My steel road bike has narrow bars.

I eventually decided to replace my carbon road bike bars to narrow, too, because I became accustomed to these. I have broad shoulders, but found that I'm more comfortable at around 40 cm. So, all of my bikes (except the touring) have this width now...

It's a matter of preference and comfort. Plus, the narrower bars give you a slight aero advantage, even on the hoods. Phil