browser security in OpenBSD

Hello,

I see there is some work in Chromium to implement secure browsing. I
was using both Chromium and Firefox over the past years. If I got it
right, here is a summary of implementations:
Chromium: W^X, pledge, unveil
Firefox: W^X

I don't want to start a brosers' war, but what is best to run strictly
from security point of view at this time?

Thanks.