Am not familiar with Bullinger.
I have listened to 100's of hours worth of Hagin tapes.
It was very, very difficult to impossible to find any Scriptural fault with what he said. He was very scrupulous about how he put things. And sometimes, he seemed to come right up to a line I was beginning to feel wary about but he'd stop short of crossing over the Scriptural balance I perceived in Scripture. I don't say I agreed with everything he said. But overwhelmingly, I found him Scriptural.
I canNOT say the same for his son or his disciples. I think probably Kenneth Copeland is the most balanced of those I've paid much attention to.
Also, I think his son and disciples are not the most humble people I'd hope to meet. That's probably a source of great . . . trouble.
Anyway--just my 2 cents worth.
I have found Copeland to be way out there and rather spooky to watch.