The thing is that you can see a betting site today having high odds than other betting sites but later the betting site may change and be like others.
The best is to use a site that can always lists the betting site and show their odds on the site for people to easily know which ones have higher odds.
There was a site like that which was posted about recently on this forum on the gambling main board.
Or you can find your gambling accounts, select the same bets and go for the one with high odd.
Edit:
This is the thread:
Found a site that helps spot value in sports betting — OddsRunYou can have some betting sites that are not listed there, the alterative method will be better. Just have like 3 gambling sites and fund your accounts there and compare when you about to place bet.