Opinions are plenty in the 2 stroke vs. 4 stroke discussion. A search on the forum would return lots of hits.<br /><br />First of all you must know the boat recommended max hp and motor weight. Beaching really does make one think about weight - in this case a difference of almost 50% between two of the mentioned brands. Also a concern when handling the motor in other situations (storage, transportation).<br /><br />In general, the 4 stroke's are more pleasant to be with, are heavier, burn less fuel, cost more, runs more quiet (at least below full flat out), vibrates less. If EFI equipped they start easier and always idles like a dream.<br /><br />2 strokes have a hard time keeping the emission laws although they are way better than the older ones. New systems come up, but think about buying a brand new technology...<br /><br />If you do any troling a 4 stroke will handle this better. No plug fouling (as there is no oil residues in the combustion chamber).<br /><br />Access to service should be considered. A reliable and skilled workshop nearby is important should anything need fixing. Cost is an issue as well - bear in mind that not many actually pay the listed price as 'specials' occur all the time (ask for it - the dealer may not mention it if not asked).<br /><br />Depending on the area you are in, even Tohatsu could be considered. They are known to be of good service to professional users and are not too difficult to service yourself (rumour has it, that Tohatsu actually make the majority of small outboard engines for the big brands to sell under their own names).