Yes, I know there's an abundance of other verses to use for proving the Trinity, and I love to use them. But 1 John 5:7 would be the most obvious, even more so than Matthew 28:19-20.

I feel I should clarify and say that I've not seen any thoroughly convincing evidence that the TR and AV should be more reliable than the other variants out there. And, of course, I mean primarily the missing verses which are found in the TR and AV but not the Westcott & Hort and its translations.

Thanks for your answers, much appreciated!