Which students?

I have a delama; I am changing schools at the end of the term and I'm not sure which students to base my action research around:

• Shall I focus on the students at my current school and carry on with them after I have left? or
• should I focus on students at my new school who I will have daily contact with from the beginning of Term 2?

The advantage of focusing on students are my current school is that I can start straight away, or at least from the beginning of week 11, and I know the students well.  The disadvantage is that I will lose regular contact with them once the term finishes.

The advantage of focusing on students from my new school is that I will have regular contact with them from the beginning of Term 2.  The disadvantage is that I can't realistically begin until the new term starts, meaning that I'll only have a limited time to work with them.

I'll need to make my decision soon, and plan to by the end of the weekend.