Individual or group training for two dogs?

I have two dogs (ages 3 and 4). They're very sweet and food motivated/smart, but are very excitable and have trouble listening when they're excited and get distracted easily. The smaller one is also sometimes a jerk to the bigger one (e.g., she moves closer to him and then growls that hes in her space). I have been trying to work on these things myself and eventually realized i could use some professional help. I had a few questions related to this;

1. Would people recommend I start with individual training or a group class? I'm open to doing both too.

2. For either one (group or individual), would both dogs be trained at the same time or would I have to take them one by one?

Thank you!