Sorry, I did not see that actually it was KH, and not TH. My bad.
The hashrate of each miner is subjective, it has everything to do with the algorithm it works on, in other words, a car that does 50km/h competing against 20 old men on wheelchairs is certainly a lot slower than a car that does 300km/h, but when latter is competing against a dozen ballistic missiles, the slow car is "better".
So ya, don't compare different miners from different algorithms, there could exist a miner with the speed of a few mega hashes that makes more "money" than a truckload of the fastest Sha256 miners, but you need to keep in mind the future competition, SHA256 difficulty is hard to move, 5% is considered a lot, whereby the overall difficulty of other smaller algorithms could easily double in a few days, so ya, there is more to it than meets the eye.
Thank you for your response, and I understand your message.
I was looking actually, if I could get one with a price that is accessible to me, for a machine that does not need so much electric power (right now the price for KWh in Ontario is pretty high), and has a higher speed, TH/s. If you could tell me a source where I could get one, it would be great.
I was looking by myself for machines, and do not understand why machines for BTC mining are most of them produced in China, though China is prohibiting the ownership of BTC... However this is because I am still a noob...
Have a great day