I generally find sitting behind a pillar in new road gives me the best experience.
Braemar road has been ignored by the above posters but has its merits. You have to be member to get into c and d block which are on the halfway line and the best view. I tend to sit in E block and make my way to the back and as near to the half way line as possible. A bit of space to spread out, somewhere to put your drink and your program and you pie on the seats around you. Not many people who want to talk to you so you can grumble to yourself all you like.
You can go into the paddock and pretend your hard, wear a baseball cap and stick your chest out to the oppos fans and sing solo songs if that is your thing. Generally you will receive plenty of abuse from the away end as the core brentford singers are behind the other goal at the far end and you tend to be a solitary force in that area. In fact, you probably wind up looking a bit of a nob as you try to take on the whole away end in a solitary battle.
For moaning you are absolutely spoiled for choice. You can go to any part of the ground and be surrounded by people that absolutely detest Brentford, the fans, the players and anything to do with club in any way shape or form. The only time they looked pleased is when we are losing and they can offer us their smug, "told you so" smile or mutter those immortal lines "its bentford innit, we don't wanna go up". These individuals are easy to spot as they are the ones who have special markings on their seats to warn everyone else where they are to help avoid them, these marking are easily identified by the words..."seat reserved for season ticket holder"