Breviarium Monasticum: Pax inter Spinas compared to Farnborough

I have the Pax inter Spinas Monastic breviary, it's a good set, what I always wanted except for the plastic covers.

I also have the Farnborough Monastic Diurnal 7th edition, and have been looking at their Monastic Breviary which appears to be leatherbound. It's also considerably less expensive than the Pax inter Spinas. They also seem to be two different publications of the same publication, but the latter has some extra suppliments in the back.

By the photos the Farnborough looks like a better option, but the cost says otherwise.

Can anyone who has, or who has handled both, give a comparison of the two? Is the Pax inter Spinas worth the extra cost even with the plastic covers, or would the Farnborough be a better investment?