If you love minimalism, then Livescore is really good thing. It's also good option when you're on slow internet connection, but still want to check results. I used them, but there isn't enough features for me. This is why I prefer Flashscore. Now they even added audio commentary for main leagues games - it's good thing when you can't watch game. And I like them because you can follow all sports, starting from football and basketball and ending with floorball or waterpolo. So, I don't need multiple apps for every kind of sports that I follow.
Haven't tried SofaScore yet. I'll check them out.

There is more players than yellow caps available, but I think it's most likely that some players will get it multiple times. If you're on the top of table, it's likely that you got yellow cap more than once.