Last season, Chelsea did not win both matches against Brentford. But Chelsea will win all 3 points against Brentford in the derby at Stamford Bridge. Coach Pochettino's team has just collected 12 points and is currently ranked 10th. This is a ranking that is not commensurate with the caliber of Chelsea, one of the biggest names in the Premier League. In the last few matches, Pochettino has finally created some momentum to help Chelsea significantly improve the team.
Brentford is not a worthy opponent for Chelsea. Brentford have not been at their best this season and may struggle to stay afloat. Even if they score in this match, a victory for them will be too difficult.
Chelsea always have problems when we expect too much from them I mean in a match that is easy to predict when Chelsea plays at home they should be able to win but in the end they lose or draw so there is no need to expect too much from them in this match. We know that recently Chelsea has played better at least in the last 3 matches but as you said against Brentford it doesn't seem easy something could happen for example a draw. For betting options, I would prefer both teams to score rather than 1x2 market because it is predicted that both teams will score each other and it doesn't matter who wins. Crystal Palace vs Tottenham is also interesting to wait for and see if Tottenham can continue their dominance.