I've had both.
When assembled I really would not be able to rate one above the other in the sturdiness stakes. They are both very good - the manfrotto is let down just a little by the centre column mount, the redsnapper is let down just a little by the plastic centre column head.
Actual build quality appears at first use the same - although after using my redsnapper a bit I found the legs came loose quite frequently and needed tightening up. This coupled with the fact I find twist lock legs slow and annoying is why I ended up selling the redsnapper on.
Although to be fair I also sold the manfrotto because the centre column mount annoyed me.