Originally Posted by Risemix
Isn't it always best to make a play for their mid while they gank bottom to take advantage of the fact that they have less resources available there?
There is very 'always' in dominion.
A good time to make a play for middle is when top is a tough nut to crack and they have all 4 of the champions there. Ideally you have a very mobile champion continue to harrass top, one capping mid and the other two in the jungle positioned and ready to act based on how the enemy team reacts.
Also when you are going for a 5 cap