Several thoughts: Well-engineered dagger-boards provide some significant advantages in terms of performance on all
points of sail: yes, upwind you will tend to point higher due to the better hydrodynamic shape and sail faster due to less drag than LARs keels; but even off the wind
one can reduce drag by raising them. This is, of course, to say nothing about the advantage of having less draft
available for anchoring
Properly engineered boards should be sacrificial to the extent that they will shear off before causing damage to the trunks, so that the fears expressed about another hole in the bottom are largely unfounded. While they do take up some additional interior
space, in the size of cat that you are apparently considering, they should be able to be integrated into the interior
without being terribly intrusive. Furthermore, most daggerboards in that size of vessel do not require any complicated hydraulics but rather, a simple block and tackle arrangement. In that connection, unlike a ballasted swing-keel, there is no risk of an unballasted dagger board falling off when deployed.
Lars keels are simple, if properly designed with shoes will tend to assist in beaching the boat for maintenance
and if not sacrificial, can hold substantial tankage in an area that will keep the weight down low - where it belongs for stability. I suspect, however, that the principle reason for their inclusion in most low to middle priced cruising cats is cost: it is, I suspect, cheaper to manufacture a boat with them, than to properly engineer
and build the boards, two very strong trunks bonded to both the hull
in conjunction with the necessary lifting mechanisms.