Not sure you'll find many who have ridden both in Ti form. I have the Ti 456 and tested an mmmBop back-to-back with the 456. I was actually considering swapping to the Ragley, but ended up keeping the 456.
Why? Well as all the reviews say, the 456 is a stunning bike, esp in Ti form. Quick, agile, holds a line v well downhill, and the short front end means you get a load of weight over the front to carve into turns. Even with 150mm it climbs well too. It's a bike you can jump onto and immediately feel at home.
In comparison, the Ragley felt decidely "odd" to begin with, and whilst I suspect you'd get used to it over time, I didn't feel at home on it in the same way. I'd hoped the Ragley would have a bit more of a hooligan element to it than the 456, and whilst it did, I felt I lost some of the things I liked about the 456.
I've now got an Evil Sovereign alongside the 456 Ti – that does the hooligan thing to the nth degree, so now have both bases covered! Now if only someone would do one of them in Ti…..