Arsenal - Brighton seems like an interesting one. Both sides started with two wins. On paper, Arsenal are a huge favourite of course. But I don't think it is worth betting on them for that low odds. 
Both teams got positive results in 2 early matches in EPL this season. In matchday 2, both teams defeated strong teams. Brighton defeated Man United, Arsenal defeated Aston Villa. But Arsenal should be the favorite team because they will play at home for the next match and they actually have a better quality of the players. Sure, this won't be an easy match for Arsenal even if they are the favorite team to win the match.Considering how productive they are, I think both teams to score could be a good option to bet on. Over 2.5 goals is also quite possible. I feel like Arsenal will win by 2-1. I hope they win before anything else.
You don't only consider their productivity in scoring goals, you also need to consider how strong their defense is. These teams have a very strong defense, Brighton only got 1 conceded goal so far and Chelsea still got 0 conceded goal. Considering this fact, it seems both team to be difficult scoring goals. Arsenal 2-1 Brighton looks a very reasonable prediction. I think your bet will be correct this time. 