I love youtube video tutorials! But, they aren't as portable. You can't listen to them everywhere, you may miss things and have to watch the video many times, and you still may find things you miss. But, most of all for me, I like to print articles out and read them during rehearsals, on my stand, on the train, in the doc's office, etc. There's nothing to miss when you have the printed word.
The down side! Much of how we learn the trumpet is non specific, internal, hard to put into words, etc. It's also much easier to do a video and talk than to try to explain yourself on the written page. It comes down to personal style. I like to write. I'm ok with learning to express myself this way.
With that said, I do hope to add some video's in the future to enhance what I have written. With both, hopefully, you can get a sense of my approach. I hope it helps others out there in trumpet land!