My issue with Purolator BOSS is that when I ran it (the older synthetic model) by truck ticked, and when I went to RP with no oil change, yes tick went away. So I gave up on boss, however that was before the noted redo of their filters. Personally, I have no reason to look beyond RP, I found my filter. However, I like the new boss, if RP folded today, the new boss would be on a very short list of my potential filters.
They used to have bypass rating on RP, I do believe it is higher then boss, maybe as much as 10psi less, but cant say 100 anymore. Which means, in some places like cold regions, maybe puro boss is even better then RP. In my area, RP serves me well.