Now strung one stick in 4g/gut and the other in gut/4g.
My findings (for what they are worth)
4g mains offers more spin, less power and less feel. Gut wear is more, which surprised me.
Gut main, is more powerful and has much better feel. Spin is great but not as good as the poly main.
I've played with gut mains for a long time and love the setup. A poly/gut hybrid is new to me and I thought it wouldn't compare...but it does. I'm still not sure which setup I prefer as I love both for different reasons.