Got a set of Pyramids for my Höfner, not because I didn't like the LaBellas, I just need to have some backup strings.
So I put on the Pyramids, and first impression is that they are a bit more lively than the LaBellas. For some reason the LaBellas seemed to have more clarity in the lows to my ear. Tension feels similar, both are smooth as silk, the Pyramids perhaps a tad smoother.
Things might change a bit after the Pyramids settle in properly, but I am tempted to say that these are both excellent strings, and equally great. Either works very well on a Beatle bass, no need to "upgrade" to the other whether you have LaBellas or Pyramids.
For most people I believe LaBellas cost less, in my case they're about the same.