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I do agree the split VCLS post will add more comfort (probably in more of a percentage as Phil says, rather than an arbitrary X-psi) but Eds point about tyre width still stands. On 4 inch supple slicks with latex tubes the seatpost could be made of scaffolding or be the worlds bounciest carbon, fuck if you'll notice the difference
Id love to blind test people and see if the real world difference is noticeable
Turkish
@edscoble in being wrong shocker.
I can't find the study right now - could have sworn it was Silca but it's hard to track down. Basically the difference in deflection between the Canyon VCSL split seatpost and the inline Thomson (the most and least compliant) equated to 27psi, when the difference in compression is expressed as a pressure.
The seatpost you use, depending on variables like how much is exposed etc, seems to be the most important variable other than tyre pressure/size on ride feel. Much more so than frame material.
Some initial reading for the insanely bored amongst us:
https://silca.cc/blogs/journal/118397252-tire-size-pressure-aero-comfort-rolling-resistance-and-more-part-1-how-we-got-to-now
http://www.velonews.com/2012/12/training-center/technology/from-the-pages-of-velo-getting-the-most-from-your-post_267560
https://www.cyclingabout.com/seatposts-overlooked-yet-critical-for-cycling-comfort/
http://www.tour-magazin.de/komponenten/sattelstuetzen/sattelstuetzen-testprozedere-in-tour-62011/a10145.html
the last one is a bit outdated now but still then most comprehensive look at seatpost deflection around.