Reddit mentions of Journey Without Goal: The Tantric Wisdom of the Buddha

I'm not sure I can speak on the nature of Zen so a comparison may be a moot point. I know my teacher's father was mentored by Shunryū Suzuki Roshi, but I know there is some debate in this forum (ad infinitum) regarding the nature of Zen and its delineation from Suzuki's lineage of Buddhism.

Within the context of Trungpa's relationship with Suzuki, the Shambhala tradition has incorporated many Japanese traditions into our community. We practice a Japanese walking meditation in addition to our own sitting practice. We practice Ikebana. We practice a Japanese tea ceremony. We even discuss Zen teachings as well as many of the Chinese and Japanese Buddhist teachings that are controversially debated as Zen or not Zen.

The question of doctrine is interesting, but I'll simply reply asserting that all dharmas should be regarded as dreams.

I can say that, in my experience, cultivating a small understanding of Hinayana and Mahayana are requisite to digging into Vajrayana. My teacher's father wrote a book called "Journey Without Goal" that provides a cursory look at Tantra. It's a great start.

There are many others I'd be happy to recommend if you wish. Of course, I do not recommend any of my own practices nor do they claim they lead to truth.