Tend to agree. Rudisha has undoubtedly the best overall record over 800m (2 Olympic golds, World Champ golds, 3 world records and that front run to a WR in an Olympic final), and thus has to be recognised as the GOAT.
I agree, however, that Kipketer was a more versatile 2 lap runner in that he could win in any type of race (bar poor tactics), be it slow or super fast, and that his 1:41.24 in Zurich off a ridiculous 48.4 split, is intrinsically a better performance than the current WR. Rudisha was tactically savvy and usually ran to his strengths, i.e fast times from the front behind his own pacer. He was not 'obviously' capable of running in the pack off a slow first lap and then waiting to the last 200m to kick.
Having said all this, I do have the slightest suspicions about Kipketer:
1. Differing DOB - for years (while competing) his DOB was given as DEC 1972, then it started appearing as DEC 1970!
He ran 1:49.6 in July 85, at either aged 12! or 14. Yet by end of '89 (either aged 18 or 16) he had only improved to 1:47.0.
On most databases they seem to have agreed his DOB was Dec 1970.
2. Slow, plateaud rate of progression -
1988 - 1:47.0 (15 or 17)
1989 - 1:47.2 (16 or 18)
1990 - 1:45.7 (17 or 19)
1991 - 1:46.19 (18 or 20)
1992 - 1:45.62 (19 or 21)
1993 - 1:45.46 (20 or 22)
1994 - 1:43.29 (21 or 23)
1995 - 1:42.87 (22 0r 24)
It took him 6 years to move from 1:47 to breaking 1:45. This is quite an anomaly for an elite 800m runner.
3. The era in which he ran and excelled, the late 90's, was rampant for EPO use and there was no test until late 2000.
I am not convinced that Kipketer was using EPO, but I tend to feel more confident that Rudisha was natural and not assissted as opposed to Kipketer's rather unusual progression.