Discussing how early Christians came to consider Jesus divine will lead us far afield. Let's just note that they did and continue with the comparison.
One asymmetry between the two is that while Buddha lived for a long time and left a large literature of sayings, Jesus had a very short ministry that ended violently. Thus we have lots of materials regarding what Buddha thought, said and practiced....that for Jesus is understandably much less. Do you think this affects how well Christians can know about Jesus from the Bible, compared to say the Buddha from the Suttas? I typically come across the question "What would Jesus say or do or think?" and the answers diverge among Christians. For Buddha, such questions usually have quite objective answers, if we can successfully trawl through his 10,000 page thick Suttas and Vinayas diligently.
Yes, that's a very key difference between the two figures, I think.
When you think about it, Jesus actually did get a
lot said and done in just under three years time-span, relatively speaking, but compared with the Buddha's long life and extensive library of attributed discourses, it is like a pebble compared to the ocean.
Jesus's preaching has a
frenetic quality to it - the words, parables and pithy maxims of a generally young man of action - evidently on a determined mission that would lead fairly quickly to the big fiasco in the Jewish Temple, his betrayal, arrest, conviction and execution. And yet, he managed to have such an impact on his immediate circle of followers that they became convinced he was a pre-existent divinity after his death.
The Buddha's discourses are long and more sophisticated in their presentation, as befits someone who had a
long time to reflect on things, with a good deal more intricacy. And yet he too was viewed as a supramundane being after his death.
That is why the four Gospels which tell us about the life and words of Jesus comprise 47% of the New Testament, whilst the Book of Acts (detailing the lives and early activities of Jesus's first followers after his death), the various epistles written by Paul and other sacred authors, and the Book of Revelation, total in at 53% of the combined volume of textual material.
If you think about it, the New Testament is majority
Abhidhamma Pitaka (scholastic re-working and expansion by Jesus's followers) - which gets extended to gazillions of books by the apostolic fathers and early church fathers - whereas the
Tripitaka has enormous sections of
Suttas.
That said, it bears remembering that everything we find attributed to both Jesus and the Buddha in the Bible/Tripitaka, were composed by their disciples after their deaths.
It's arguable that much of the Pali Canon was set to writing over a much longer span of time than the gospels: I mean, it was finally set to writing
454 years after the death of the Buddha at the Fourth Buddhist Council whereas
the Gospels were all written within 30-60 years after Jesus's death, by the end of the first century. There are earlier Buddhist texts subsumed within the finished, canonical product and what they tell us is illuminating.
In the same elapse of time in Christianity, we'd seen hundreds of gospels - such as the Gnostic tradition - attributing lengthy discourses to Jesus, the creeds, the writings of the church fathers etc. The big difference here is that the church fathers were far more selective and narrow in what they made into sacred scripture.
If we limit Buddhist texts to the earliest strata of material, which scholars can identify with the oral tradition, we find perhaps a less systematized Buddha: the Sutta Nipata and Udana are thought by many scholars to be the earliest, from a pre-canonical/pre-sectarian phase of Buddhism in which a redaction of theology, through commentaries and editing by Bhikkhus, had not yet taken place. We can see this development reach a peak in the Abhidhamma Pitaka with its highly detailed reworking of the Suttas into a coherent system.
There is very little discussion of such systematic ideas as the three marks of existence, the Four Noble Truths, the Noble Eightfold Path and anatta in the Sutta Nipata, especially in its earliest stratum of texts - these being the Atthaka Vaga and Parayana Vagga.
These two earliest sections of the Sutta Nipata are more focused on explaining what makes the ideal person, the ideal contemplative. There is no reference to structured monasticism in these texts, as with later Buddhism, rather the emphasis seems to be on solitary forest ascetics - hinting that these texts arise from a period before the emergence of the Sangha as we would know it.
The Atthakavagga has far more archaic phraseology than the other Suttas. It utilizes and re-works brahmanic terms and words, which indicates that a uniquely Buddhist vocabulary had not yet emerged when it was written. The Atthaka is also referenced by other suttas in the canon, which suggests that it must therefore predate them.
New Testament scholars can do the same for Jesus - and discern the
Q Sayings Source as the most primitive material, although the synoptic gospels in general would be equivalent in primacy to the earliest Buddhist material I've just been discussing.
I would opine that we should see the later New Testament books, the subsequent apostolic fathers and the early church fathers extending all the way up past the First Council of Nicea doing something similar for Jesus's teachings as what the Sangha did relative to the Buddha.