Use any brand of oil that you want. 10w30, 10w40, 15w40, 5w40, straight 30, even 15w50. Dino 15w40 is the best value for protection and price. Good ol' 30 weight is right up there to. What is most important is not the brand or weight but checking the oil level in your engine before you start it for the day. If it needs a few ounces then top off the engine. Most engines that I replace are due to being run low or out of oil. Doesn't matter if the user ran Amsoil or Supertech, if no oil in the crankcase then all will experience the same outcome.
Don't get caught up in the hype and don't overthink things. Keep your blades sharp, keep inside of the deck clean. Check the air filter daily before you fire up the engine. Clean or replace it as needed. Grease the machine on a regular basis. Inspect and clean the cooling fins on the cylinders once or twice a year by removing the engine housing. If you see dust and chaff in them then brush them off so the engine will run cool and live long. Check the oil level each day before you fire it up and add oil if needed. Dino or Syn oil regardless of weight/brand just make sure that the dipstick shows full. Change every season or 100 hours along with the filter all all will be good. Now for adding a beer cooler and lights, well that is another topic.
P.S. Top off the tank with fuel and gas preservative during the fall after each use that way you will be set for next year and experience no fuel related problems next spring. If you really are serious then hook up a battery tender and plug in after each use.