No comment on the specific computers you are looking at but I do recommend that you consider getting a nitrox capable computer.
In general, you will find the Suunto computers more conservative, particularly in response to "bad dive profiles", such as even a momentary rapid ascent, sawtooth profiles, reverse profiles, and short SIs.
The Oceanic computer, in general, are much more liberal, and ignore the details of the profile such as rapid ascents. You will have to apply your judgement as to how much additional conservatism to apply to compensate for less than optimum dive profiles.
One significant advantage I find with the Oceanic computers is the tissue loading bargraph, which is more akin to a graphical display of N2 loading than is the Suunto bargraph, which is merely a graphical display of the NDL.
The difference becomes obvious during an ascent at the end of a dive. The Suunto computer will immediately go to the green as the NDL increases to infinity at 15'. On the Oceanic computer, the bargraph will continue to show your N2 loading, and will slowly decrease only as you offgas.
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I assume that the patents on the tissue loading bargraph have expired. Does anybody know of a computer that combines the Oceanic/Pelagic style bargraph with an algorithm like Suunto that responds to things like fast ascents?