Debating on which tubing to use for my next build. The frame is going to be lugged and is going to be used daily on the streets.

I keep reading that Life/Spirit is lighter and slightly stronger than Zona but is susceptible to dents because it uses tubing that has very thin walls. And we all know no one likes dents. I care more about durability than weight.

Also on another note, what is the difference between Life, Spirit, and Spirit Keirin? Is it just the weight?

Please note that I, myself, am not building the frame. Rather I have the choice of these tubings.