I m a OW Emerald with AY, and will stay this for the next couple of years (as long as I fly I guess), but I always try to get some status with BA as well, as it looks like right now I can stay BA Silver - but does this gives me any extras compared to an OW Emerald on BA?

As BA Gold I got a few upgrades to First, that was nice, but what is the situation BA Silver vs. OW Emerald?