Looks like the SMD is 24 watts > than the one on ebay yet the voltage is 100 less? How does that work?
The xmas lights on eBay undoubtedly have a built-in AC-to-DC transformer (power supply).
As far as watts, the xmas lights are 0.6w per meter length. The SMD is 6.8w per meter. The watts per chip doesn't mean much except how many chips you have to use to get the same total watts. Very weak chips won't have as much penetration. Very strong chips are less suitable for small spaces where you'd prefer to distribute softer light because you can't get the necessary distance between the plant and a stronger (single) source of light.
What's important is
1. Lumens per watt. We know from SMD 5730 specs that it's around 105-120 LPW.
We don't know what the xmas tree lights are.
2. The spectral power distribution (SPD) of a white LED.
Older, cheaper whites like used in flashlights (and I assume xmas lights) are very notched red, green and blue. Nothing in between.
The newer whites (used in grow lights and LED "lightbulbs") have a more natural, sun-like curve. The SMD diodes are like that.
Also on the color, White is better than red/blue? Are you saying that because these particular lights are weak or generally?
White has been the recent trend in grow lights because balanced (not RGB cheap whites) has only recently become affordable. It seems white with some dedicated red (and blue) might be best. But, white-only grows very well.
The legacy argument is that LEDs are efficient because you can target specific wavelengths the plant uses. That's kind of true, but I think it was emphasized in the past as a way of explaining the unnatural appearance. I.e., the unavailability of an efficient and cost-effective white. Now that the latter has become available, the efficiency argument is more about lumens per watt and less about targeted wavelengths. Plants have always benefited from some cyan, green, yellow. Now that whites are viable, you hear more about those long-lost spectrums.
If you have some DIY tendencies (which you must have if you're going to strike off into draping your plant in xmas tree lights), put that time into researching how to connect a DC power supply to SMD 5730 strips, how to mount them in your space, etc. You'll at least be working with a known diode, something knowledgeable enthusiasts are using.
For the price of those xmas tree lights I don't think you can go wrong. It's just that for the time you'll spend on it, I think you'll be much happier using diodes that are known to grow weed and that produce in the area of 90-110 LPW.
