I use in 90% of time Sofascore because i really like the design and have all i need and its simply to see other sports and more.
I dont like the interfase of the others sites here mentioned.
The famous website for checking live scores got the same domain name livescoredotcom I've been using them for the past 4 years and the reason why I kept on using them is the notification they send out to me and other users when a team score, also the interface of the website is easy to navigate in terms of searching for a team or sports games.
I know about sofascore but they are missing some of the features I want so I don't use them so much.
Nice thing they have is graphical attack momentum.
Donts trust so much in the attack momentum its ok but needs to improve maybe you think one team is ttacking heavy but they only have the ball in 3/4 of the pitch. Take care one you made a rapid look.