I have the traditional arbor bore sighter and a green laser bore sighter. The laser bore sighter I have is very good but they aren’t cheap.
https://www.midwayusa.com/product/2130726870/wheeler-engineering-professional-laser-bore-sight
I also have a small scope mounting business. Neither of my bore sighters do a better job than the traditional way, but they do just as good of a job, are more convenient for me and save me a lot of time.
If you get a laser sighter green is more expensive than red but much easier to see in daylight.
Bore sighters can also be used to do a quick, down and dirty test of whether a scope is tracking okay. Not super precise but will give you an idea. In this area an arbor sighter shines but they don’t work on every firearm, hence the laser sight.
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