RF 433MHz - RXB12 vs XY-MK-5V
The electrical interface of both receivers is identical. If have changed back and forth between both models in a couple of Arduino circuits. The RXB12 is strongly superior in quality. It is a superhet whereas the XY-MK-5V is just a analog resonator combined with an op amp. The RXB is also much better, if there is RF noise due to its better signal filtration.