...prefer a liberal computer that I can make conservative over a conservative computer that I can only make it more conservative.
This has been discussed many, many times on SB, but, is often forgotten. You can make a liberal computer more conservative, but, you cannot make a conservative computer more liberal. You can always dive a liberal computer conservatively, i.e. stay further away from NDLs, even if you do not adjust the algorithm.
Oceanic dual algorithm computers have four decompression algorithm settings. From most liberal to most conservative, DSAT, PZ+, DSAT with conservative factor and PZ+ with conservative factor. These settings cover a very wide range. As an example, the table below shows first dive NDLs using 32% nitrox:
Anyone diving with Cressi RGBM, Mares RGBM, Suunto RGBM, Scubapro ZH-L8 or 16 ADT, Atomic RGBM, Bulhmann ZH-L16C with GF, or any other decompression algorithm out there, can use their dive planner and compare their first dive NDLs with the values in the table.
Of course, first dive NDL does not adequately describe the performance of a dive computer. There is little information available regarding the performance of dive computers over repetitive dives. ScubaLabs performs a simulated four dive sequence in the Catalina hyperbaric unit and includes this information in their computer reviews published in Scuba Diving Magazine. You can criticize this publication all you want, this quantitative data is one of the best things they do in their product testing and is some of the only information available. This is the link to the results from 2014 testing
http://ads.bonniercorp.com/scuba/PDF/ScubaLab-Computer-Test-September-2014-data.pdf There is additional information available from the Scuba Diving Magazine website. For example, the 2017 testing results are available as an Excel download from
11 New Dive Computers Tested By ScubaLab In 2017 A wide variety of computers are tested, including the Shearwater Perdix, the Deepblu Cosmiq, and 9 others.
Many dive computers have the elements that would make them acceptable to a diver. The decompression algorithm is one important variable that might help dictate the correct personal choice. An informed consumer is a smart consumer. Best of luck to all making a choice for a new dive computer
Good diving, Craig