How do you rate the various 'available' brands of Valium/Diazepam these days?

I still have some from one vendor a few years back, loose blues/10mg Roche that - just checked - taste and feel as good as they ever were.

I also have some blisters of 10mg Ranbaxy from the same time and geo-location that were pure white and very good at the time but now have a mottled grey discolouration - not sure about quality, wary of the discolouration. Both were stored separately in same location/conditions, for years.

Do you have any opinions/experience/preference for particular brands available these days, anybody?