M Triangle is a popular make laser, I personally have TBK. These types use a built in pc or require a laptop to use software, or even import files to customise things, like pictures or messages on the glass/certain metals.
Then there's a forward blue laser, pretty much plug and play, but it can litterally only do phones, nothing else.
Lasers can work 100% of the time if you're ae to assess how the glass is broken, as the light can refract and hit a component. 90% of these issues you can usually replace the component. But if you “mask” the vulnerable area, you won't have an issue. You can even buy covers now, which will only allow the laser to hit safe places.
Heat, you need a really sturdy desk clamp, a good hot air station and a small hobby knife blade.
You have to be very careful not to cut any cables, or hold the heat in one area for too long. Problem here is, people who use laser will swear by it, and vice versa.
For me, I can laser the back while replacing/refurbishing the screen.
Also to note, logo glass, could potentially land you with a law suit from Apple, alot will bang on about logo glass, but alot don't realise it's the same for housings too, unless you're using genuine pulls, then anything with a logo should be considered a no go. You find most who use logo stuff will work from home.
In regards to quality, one answer was to do full housing swap, I offer both, housing and glass only, this way, you price accordingly for your time, and customer gets to choose. Majority of the time, they want glass only, unless I say I can't fit the glass to a bent housing.
Yes it's alot of money, but the markup is much better! All I had was a heat plate, some basic tools, and truetone writer. Bought the laser machine, and I now have my workshop done out, spent thousands more on soldering equipment, and screen refurbshing, screen protection machines. You need to choose which path for back glass (laser/heat) and then reinvest into other kit, as trust me, it'll come in very very handy, otherise, in a couple more years or so, you'll either need to send the phone off to a microsolderer or a refurber as you won't be able to compete with the prices being offered around you.
Best of luck 👌👍