I'm pretty sure most of these companies all order bulbs from the same Chinese manufacturers. The only company where I've perceived a difference in quality seems to be Comet who really have some nice colors going.

If you go on alibaba you can literally look up the distributors that are clearly supplying these companies.

I'm not sure that's always true. To me, I perceive a considerable amount of extra "pop" when using clear domes for inserts. If it's a larger insert (like in your pic) I agree though. I'm experimenting with using 4SMD bulbs (no dome) for the larger inserts on my WCS '94 -- we'll see how that turns out.

I use color matched inserts, but sometimes colors that you don't expect highlight a particular insert better than others. For example, I find that pink from Comet does a really good job making red and purple inserts pop. It does change the color hue slightly so I don't use them as a general rule, but rather to make a particular set of inserts stand out against others, for example. I use good quality warm white bulbs for yellow inserts/domes or amber if I really want the color to be rich.

You absolutely can do white if you don't want to bother trying to track down individual bulbs for color matching; it is a PITA... but it is really nice and even as the insert gets old and cracks or fades, your color will remain vibrant.

I disagree, I think the cost of non-ghosting bulbs is unnecessary. I'd convert and either use an LEDOCD or just see which bulbs ghost and then replace those with non-ghosting equivalents. Ghosting is simply an issue of a small amount of voltage leaking so it's completely unnecessary to make every bulb non-ghosting, just the ones affected by said voltage. You gain nothing by having every bulb be non-ghosting.

A non-ghosting bulb isn't better than a regular bulb, it just has a resistor to suck up the loose voltage. I wasn't saying people should buy cheap bulbs, just that using all ghosting bulbs is an unnecessary expense.