So if one was thinking about using color disks, TRI silver would be the best option?
Yes - but (there's always a but), honestly - I would only suggest this if you primarily want a Silver blade with the option for color once in a while, as the gels do cause you to have a dimmer blade.
If you primarily want color mixing - you would be
much better served getting an Emerald saber, even if it means waiting longer to save up for it.