That's really like comparing apples and oranges, because a good boresight collimator has many uses. I own a laser boresighter and always use a collimator instead. Part of the problem is that the bore attachments for the laser boresighters that fit in the muzzle are are poorly constructed. The laser is usually far from parallel to the bore.
The lasers that fit in the chamber have similar issues. At best, they tell you the direction the chamber is pointed, whereas you want to know the direction the bore at the muzzle is pointed. Similarly, lasers that attach to the muzzle crown indicate the direction the crown is pointed.
The boresight collimator can be used anywhere and takes about a minute to install. Lasers are difficult to use in tight quarters, like the garage, shop or inside the house. A long distance, usually 25 feet or more, is need to see the laser spot through the scope. And it takes a while to set lasers up: a reflective target is usually needed to see the laser in bright daylight.
Most shooters think of lasers and collimators as devices for zeroing optical sights. A collimator is a general purpose instrument that allows reproducible measurements of boresight misalignment. When I install a scope on a rifle, I use the collimator several times during the process to check boresight alignment of the rings. Finally, I use it to set the optical zero. However, barrel vibration will usually cause a sporter weight barrel to throw shots several inches away from the bore direction. A boresight collimator is often no more accurate for zeroing than looking down the bore.