What does annoy me from time to time is people not being critical what so ever. Plz stop copy pasting comments like "you can have the 8 colour pencil box or the 64 colour pencil box."
Have you studied intensly for at least a year with a level 5 SLS or Seth?
Do you really know the fullness of what they think or are you just a guy copy pasting and believing all that is thrown at him?
All methods have different merrits to them, and you'd be a fool to just holy believe in the one method, frankly you're limiting yourself.
If you go claim that CVT is the ONE thing people craved for for ages, but never deeply investigate others you might lack alot of depth and understanding. In fact I think people who only advocate CVT as are about the same as people saying that SLS is the answer.
Now about the Per Bristow method. He mostly works about releasing tensions activly, which many other methods speak about, but few actually use. As such there are tons of tongue relaxing-, diaphragm expanding-, jaw relaxing, larynx relaxing- explanations and exercises.
The reason why his method is good is the following: he first teaches you to relax everything, and once you are able to do so, he teaches you to use only the muscles that are really needed to sing. With other programs you might be using a hell lot more effort then you really need, instead his approuch is starting off slow, disengaging, and then when you can manage such a feet, engage what is needed progressivly thought. Like a retrain your body.
As for the comparison with SLS, it's true that they both believe that singing should genually be a more relaxed way, but their approuch is something completly different. The one goes by it doing silly sounds on scales, tricking your voice into the mix, Per doesnt believe in scales and thinks it's a path for you to tense up, and tries to allow you to make sound happen without any constriction going on, and makes you concious of previously unknown constrictions.
He also makes you have a bigger awareness of what you're feeling, which I kinda neglected for a long time and hindered my progress.
Try to combine what works for you, and drop that which doesn't. There isn't one successfull route to getting where you want, there are many, and the combination of taking the right elements that work for you will make you kick second gear, whereas if you desperatly try to go the route of what you have predetermend as your path, will slow you down.