valve stem seals

What brand makes the best intake and exhaust valve seals for small block magnums fel-pro? victor reinz? or sealed power? or is there a better brand that i didnt list? I have seen the victor reinz seals and they look of descent qaulity. Never have seen the sealed power seals or fel-pro seals.

Any name brand will work excellent

For a head that has had the guides machined for additional clearance, I like to use a viton seal. They seem very forgiving, easy to install and dont split like the teflon ones.

can run viton because the valve would have to come out in order to install them, if i do this i plan on doing it with the engine still in the vehicle. guess now its between fel-pro and victor reinz, for some reason i think the victor reinz are a little better qaulity then the fel pro seals, idk they just look a little better and feel heavier.