Script to modify Virtual Servers default pool?

Hello Kevin,

I was looking more of an automated script where I can change the default pools to all 3 servers at the same time. For example if A, B, C are the virtual servers and have assigned pools A-1, B-1, C-1 I'd like to be able to assign new default pools A-2, B-2, C-2 in automated way. Do you know how iCR handles connections that are already created to the existing pool before being changed?

After further reading I see that setting the virtual default pool can be done with iRule as well: https://devcentral.f5.com/wiki/iControl.SetVirtualDefaultPool.ashx

Which one is the better way to do it? With iControl or iRule, or maybe there some other way to do the same thing?