I used warm white lights when I replaced my lights with LEDs a couple of years ago except for the light over the stove, where the DW wanted a white light. A couple of the "warm white" LEDs turned out to be a blueish white so I used them in an outside compartment.
Most posters have mentioned only the number of LEDs as determining the brightness. There is more to it than that. At that time there were 2 LED types that were used in most of the lights, the 1210/3528 and the 5050 LEDs. The 5050 is about 2x brighter than the 1210/3528 and drew about 2x the current so it only takes half as many 5050s for the same brightness. Now there are several newer LED types, mostly brighter.
I bought my lights on eBay and am happy with the lights. I suggest buying 1 or 2 and trying them out before buying a bunch. I have found a large variation between sellers.
The last I knew all LEDs are made in China, so buying from a US vender will only increase your cost.