I'm seeing a lot of new lights coming with Nichia lights. For example, the D25a. This has a 219 lumen output though, roughly 1/2 the output of the cree versions. Is this worth it for most people to get a pure white light?
I wouldn't say there are lots, but there are some lights. But you need to know what you are looking for to understand the differences.
For example, just saying "Cree" is also too vague. Cree is a manufacturer, not a thing. There are many Cree LEDs. So you need to specify the type of emitter. And then it's Tint code and it's output Bin.
Nichia, like Cree is also a manufacturer. The 219 series of LEDs is just one of many they make. There are also different generations of 219. The oldest 219a, which you are unlikely to find in any/many new lights these days. The 219B and the 219C. They all perform differently to each other.
And for each 219 generation, these are also binned for output and tint. So not all of them are equal either.
To this end, you need to understand, at least on a basic level the binning and tints, CRI and colour temp (in k). This will help you in your buying decision.
As for if it's worth it. It depends really.
Tint you will see no matter what output mode you use the light on and no matter what you point the light at.
How much this matters will likely depend on your personal preference and the actual subject matter you are pointing the light at.
If you are in rural areas, where there is a lot of green and brown from trees & grass, then a NW or neutral white emitter will generally be more pleasant.
If you using it indoors or in a warehouse, this might not matter as much.
Most, but NOT all Nichia Leds sold are of a higher CRI an NW tint.
The 219B and C variants will also get pretty close to the outputs of the equivalent CREE LEDs. But the difference in tint and CRI might not be so easy to tell by eye.