Hey rosalbastru - welcome aboard....I'd have to say it depends on what sport you're looking for...I generally use the ESPN site from my Android phone for score updates and it's normally pretty accurate...I know there are better ones for soccer and tennis if that's what you're looking for...maybe one of the guys that bets those more frequently can pop in and let us know what they use...
I think CBS is the best for football, I dont really score watch for any other sport
used to watch my matches on livescore.com but found out they are very slow and don´t cover so many matches. now i use some chinese site 7m.cn and bonusbonusbonus.com/ls ... also not a bad service
If you follow soccer livescores.com is good as is flashscore.com. Otherwise for me it's espn or cbssportsline.com. Cbs at times can stick and you have to refresh your page or reboot. ESPN has a tendency to not cover play by play mid-major conferences as fast as tv or nationally ranked matchups, but for the most part inform the sports fan as effectively and accurately as possible.