Given historical data, head to head matches and results from similar past matches, Surebet prediction systems and expert opinion have all converged on the conclusion that both teams will be able to score in this match, therefore validating a GG prediction (BTTS). 

Both Brentford and Arsenal have good strikers and have equally vulnerable defenses. It is quite unlikely that any of them will fail to score in this game. All 3 major Surebet prediction models have indicated a possible gg in this Brentford vs Arsenal match. Poisson prediction model shows there is a 65.58% chance for the outcome while the ELO Ratings model shows a 62.04% chance for the same. Finally, 54.35% of the Monte Carlo simulation runs for this match resulted in gg. 

This pretty much consolidates the prediction of a gg in this game. The odds for Gg outcome on major betting sites are, on average, 1.72 with an implied bookmaker probability of 58.14%. Considering that the surebet probability for the GG outcome for this Brentford vs Arsenal match is 60.66%, then this bet is a value bet. If you play this bet then you you gain expected value by 2.52%.

The expected value for a GG prediction is denoted as EV(GG) and is calculated by multiplying the amount of stake by the odds and again by the probability of winning then subtracting the result of multiplying the stake and the probability of losing. 

By using 100 as your sample stake, by calculating the EV as explained, we get the expected value for a GG in this Brentford vs Arsenal match is 64.98 which is positive and therefore a good bet.