I would say the pH would be better suited to group 2. The fish in group one would prefer a higher pH around 8. They could adapt to 7.3 but may not do as well. There are plenty of ways to raise the pH such as adding buffer or crushed coral gravel/limestone.
I voted for group 1. Because I think group two will give you more aggression-related headaches. If you go with group one, I would consider buffering the pH up a bit.
I voted for group 1. Because I think group two will give you more aggression-related headaches. If you go with group one, I would consider buffering the pH up a bit.