It seems obvious to me that the blur is far superior than trying to xc-ify the ranger. Really the only downside is the price tag; that rsv build is incredible.
I have not ridden the ranger, but have a blur tr. The blur blows me away every time I ride it with how capable it is. I mostly ride whistler, Squamish, and north Vancouver, where the trails are (imo) as steep and technical as it gets. I have an enduro bike as well and the blur is actually faster on many of the blacks and double blacks because it’s so snappy and easy to get up to speed. I only find it limited on the true enduro/dh trails where it gets very steep and chunky. It’s also so flickable and playful it’s opened up a whole new world of fun on many trails!
In terms of brands…once you go Santa Cruz you’ll never go back. Every feature is so well thought out and well put together. I probably have 3,000 km on mine and I’ve only had to do pretty normal regular maintenance. If you like working on your own bikes, Santa Cruz makes it so much easier than any other brand I’ve owned.