Well, rollie is kind of most recognised and like in asia if you asked me. Indeed, asian collectors these days talk about PPPR (PP, AP, Pam and Rollie).
IWC used to be very prestigious but some people sense that it kind of losing out a bit after being bought over by a conglomerate. I was told that last time the entire town lived by IWC, everyone worked for iwc. But that strong tradition is fading these days.
Omega is also very popular in asia. But my personal opinion is that rollie is perceived as slightly premier than omega.
Pam gained popularity during last 10 years due to richemont's good marketing strategic. But a lot of pam critics think that pam is just some 'worthless' brands which use ultra big case to attract attention.
All breitling are certified with COSC for many years. So breitling is famous for its accuracy.
Well, all in all, its a bit hard to compare which is good and which is better. Everyone has his poison. To sum up, I will say rollie is for 'status' and reliability, iwc is more of elegant design and very famous watch maker, pam is very unique look and trendy these days, omega is very well known and popular, breitling is sporty and accurate. So you will have to be very specific on what you really want to know?