How tall are you?
The lower wall of Ruby has a move on it which is fairly straight forward if you're 175cm ish or above. I'm 171.5cm. For me the lower wall was the crux of the route.
The crimps on the top wall are smaller than on the Boltest but the moves don't feel as long. I think that, if crimpy techy wall climbing is your thing and the you can make the reach on the lower wall, it could be a good one to try
If you get The Boltest wired you could also try Tatonka/Boltest link for a more endurance based 8a