Ah, well that may set off another argument in and of itself . . .
I'm realistic enough to admit I'm far from an expert on LED lighting. I know enough to get me into trouble! I've also made a few strip lights and played with boards, and I can really only give my own opinion as to why I went that route.
The main difference between COBs and strips/panels/boards, is that Chip on Board technology groups lots of little LEDs into a concentrated area (the yellow "disc" you see) which offers good light penetration and power, but at the cost of concentrated heat and arguably less efficiency (primarily due to the extra heat).
Strips and boards spread small, individual LEDs over a larger area which has three advantages: more even light coverage, better heat spread, and better efficiency due to that better heat spread (and the efficiency of the mid-powered LEDs themselves, which seem to be the most efficient on the market right now). They don't have the same penetration that comes from a concentrated single light source - think HPS and other single points of light - but they can be spread around the flowering room evenly and run very close to the tops of the plants at lower wattages to further improve efficiency.
I don't have experience with the Timber Grow Lights, and I don't have experience with COBs - which is why it's probaly better to ask someone who has experience with both what they think.
But at face value, the Timbers appear to be well built, reasonably priced and have good heatsinks.
What advantages would COBs have over strips or panels? One area I can think of is if you regularly grow different height plants, or like to grow taller sativas. Having a single point of light (inverse square law) would give better penetration and coverage to deeper canopy (taller) plants - assuming the light is horizontal. (A vertical strip or panel LED would certainly take care of side-lighting for an indoor sativa grow, and is on my to-do list).
However, if you monocrop, or have plants that are fairly even in canopy height, then I would suggest strips or panels/boards would be more efficient at providing even light coverage. But there's probably not as much in it as people think.
I'd like to give you a more definitive answer, but I don't have COBs to compare.
The LED panel plug-and-play eaquivalent to the Timber would probably be the BC Blondes 680W Game Changer here:
https://www.bcblondes.com/product-p/bcb-680-3012.htm
They have an online comparison which makes them look good, but always take those with a pinch of salt