G35 wrote:But if we took only the RS's that would definitely make this a much more difficult comparison.
From some of the above I don't think it would particularly difficult in terms of the general trends.
I'll do the Reference box composites because of ease, familiarity etc people can add more recent refined metrics if they wish
Robinson has all but one season of 90-98 above 26 PER (not '93 and throw out '97 because only 6 games), so 7 years.
Olajuwon has 1 season over ('93) and one exactly at ('95).
Robinson has all bar two seasons above .200 WS/48, so 11 years (plus '97)
Olajuwon has 3 years above that threshold ('93, '94 and narrowly, '91)
Robinson has 6 years of BPM above eight to Olajuwon's 0. Or 8 above six point five to Olajuwon's 2. Or 9 (plus '97) above six to Olajuwon's 3.
The thresholds above
are arbitrary but I haven't aggressively picked to cut out Olajuwon (if you count the 26.0 season Olajuwon has the worst included season in PER and two of the worst 3 included; has the worst included WS/48 season etc).
Pelton's WARP gives Olajuwon a narrow career total lead but Robinson the better rate player (enough so that, informed by a weighted model using mostly RS data, but acknowledging differences in apparent playoff resilience "Despite all that, [Pelton's] ultimate conclusion is that Robinson has been the best of the group of elite centers in the NBA the last quarter-century [this from 2008 comparing Robinson, Olajuwon, Shaq and Ewing]") and gives Robinson the two best seasons then one for Hakeem, three more for Robinson, one for Hakeem, one more for Robinson, one for Hakeem then two more for Robinson)
Robinson's 94-96 on-off is better every year (by at least 5 points each year - and fairly clear leads in the attempt to reverse engineer a faux-RAPM from those numbers). His impact era data is substantially better though that is no longer against Olajuwon's prime.
Granting that there's less data pre-94 (and people may generalize differently or not at all from the data available later), I haven't covered every tool and people vary in what they value ... RS only Robinson would, I think, tend to dominate these lists.