I read the book "The Power of Now" by Eckhart Tolle years ago and was impressed by it. After studying Buddhism, I came to discover that what Eckhart Tolle achieved was probably (I speculate) only the first or second level of jhana - the experience of bliss, rapture and the impermanent silencing of mind-noise. Many self-proclaimed saints probably claim to become enlightened after achieving some level of jhana.
Then there are others who claim enlightenment after acquiring some psychic abilities through meditation. You can find examples of teleportation by saints in Paramahansa Yogananda's book "Autobiography of a Yogi", which can also be found in the Buddhist suttas. In Buddhism, we find that this is no proof of enlightenment.
Apart from these, there are also some smart, eloquent and nicely-dressed persons who claim some degree of enlightenment, and give witty answers and lucid advice to the public like Sadhguru Jaggi Vasudev, who you can find on YouTube. He claimed that his spiritual teacher never spoke to him but simply touched him with his walking stick, and transferred wisdom to him in that way.
There are some reasons why I find the Buddha's original teachings as found in the Pali Canon (or Mahayana Agamas) to be much superior.
Firstly, the Buddha's teachings are often in greater depth than most other teachings. For e.g. I can see that Eckhart Tolle's teachings possibly only result in entering the first jhana, whereas the Buddha's teachings are immensely more vast.
Secondly, the Buddha's teachings and techniques are all open, well-published and well-reasoned. We can easily see what samatha and vipassana techniques are for. There is nothing that is hidden or esoteric. On the other hand, in Yogananda's book and in teachings by other Hindu meditation gurus, they often choose to hide details claiming that without a teacher's direct guidance, the intermediate and advanced techniques could be dangerous to practitioners. These techniques are also often esoteric or tantric and it's hard to see why they are useful.
Thirdly, the Buddha's teachings are often lucid, clear and obvious. Some teachers claim that some object or ritual has supernatural vibrations that practitioners cannot question, but the Buddha does not proclaim such things. For e.g. the Buddha encountered a Brahmin who believed water ablution rituals can wash away sins, and advised him that ablution in the shore of virtues will wash away his sins and not using water.
Fourthly, I find that the Buddha's teachings are more related to my own experience than other teachings. For e.g. in Hinduism, we often hear of a universal consciousness that is the eternal silent witness through every being. However, from the Buddha's teachings, we learn about eye-consciousness, ear-consciousness, mind-consciousness etc. and how consciousness is not separated from one's senses - which is more in tune with our observation.
Fifthly, almost all other religious teachings have an eternal self or soul in them, both in people and in a God. However, the Buddha appears to be the first to teach anatta, in which the self is neither eternal nor non-existent, but rather, arising out of the complex interaction of the five aggregates, as how music arises from the inter-working of different parts of a musical instrument. This is very unique and also in tune with our observation.