ABU Simples are the thickest and I believe the nicest diapers I've worn. The few I had were awesome, though size medium was a little snug on me.
They got even thicker when I added Abena maxi boosters to them ^u^
The Foresite AM/PM diaper is out of Canada , they will send you a free sample however it's $ 20 US for the shipping, they have been liked by many people as a nice thick premium however those people are Canadian who truly get it free , we in the US get stiffed.
I haven't tried the Foresite and hadn't heard about them until now. But I'd have to say the Rearz diapers are probably the thickest I've ever tried. Quite comfortable too. Thought the ABU diapers are a legit substitute.
Although ABU's Space/Simple model is very thick, they are 7.4oz/pc vs the Safari/Princes's 7.7oz/pc. Slightly more weight.
For flat-out thickness, the safari are noticeably thicker when dry than the Space. I suspect the safari are heavier not due to more sap, but due to more pulp. They seem to wick a little better, and the increase in thickness seems about right for the gain in weight. 0.3oz is not a lot more sap by dry mass, but IS a lot more pulp)
TBH though, you will be extremely hard-pressed to reach capacity in either of these diapers. I've taken a space to the wall only twice, and have yet to top off a safari.
The Safari / Pink Princess / Seduction diapers are not just thicker and more absorbent than the Space Diaper, but also "fluffier". They also swell much more. The Space diaper is still my favorite, though. It's light years ahead of the Fabine. (sorry, bad pun :sweatdrop: ) I haven't tried the foresite amm yet.....
I can get a space diaper to leak, after 12 hours and a whole lot of adult beverages and Koolaid. I haven't made a Safari leak in under 18 hours, yet. I like challenges. :biggrin:
The thickest I've tried were the Rearz Inspire+ InControl (plain white version of the Safari as I understand). Definitely thicker than the ABU Simple which I actually didn't like because of how thin they were in the front.