I am confused from choosing of chelsea vs valencia or inter milano vs sparta prague which one guys!?
If you are confused to choose which one has a higher chance to win, then just forget to bet.

Betting is only for people who are confident to take a risk and smart enough to analyze the possibility.
If you ask me Inter are clear favorites against Sparta Prague but the Chelsea - Valencia match is a bit more tricky.
Agree. Inter Milan should be the favorite to win against Sparta as it has more world-class players. Moreover, Inter just got new strong strikers [Lukaku and Sánchez]. While for Chelsea vs Valencia, I think the chance is 50 : 50. We mustn't underestimate Valencia because Spanish club often bring surprises as an underdog.