I don't know, haven't personally used either one.
What I can say is the the Laird have a very large base. If you are trying to keep things low profile, the Larsen may be a better choice.
The new larsen has a spring lower down at the base, which can be a benefit if you are putting this on top of a taller vehicle that may find low parking garages or tree branches. The taller base on the Laird won't fare as well.
I'm a big fan of Larsen, but I do have some Laird antennas, and I've been happy with them. I stick with Larsen due to habit, but nothing at all wrong with Laird.