I think that what you buy is going to depend on what kind of a deal you
get and how good your local service people are. (and how close!)
Most of the major names have good reputations. You'll probably see
all of the major names represented by IAP members. Like any other
major purchase, the buyer is emotionally invested in their own equipment
and that is what they know. So that it what they prefer and recommend.
Just keep that natural bias in mind when you read comments.
Get what you can afford, with good local service.
Check the engraver's forums on Sawmill Creek, too. Tons of laser users
there with a lot of knowledge and experience.