Just so that we have all our information correct, (though i am not very fond of Samsung lately) the last update that was released was Android 4.4 not 4.3. i have had an S3 for the past 3 years and to my surprise 4.4 actually ran very well on Samsung's old hardware, something i can say that apple has not achieved. The Iphone 4s barely ran the latest IOS, forcing people to upgrade to a newer phone.
Comparing IOS and Android is something that you have to be very careful with. You're trying to compare apples and oranges. Remember that IOS is only distributed on Apple devices, while Android is distributed to devices that are made by many different companies. The only comparison you could make that might be viable would be a Nexus device. The Nexus devices run "pure" android and if you were going to compare operating systems that would be the phone to use, not Samsung's flagship(Samsung did however make the original nexus phone). Also the new Android 5.0 release looks and runs just as good if not better than the latest IOS.
Keep in mind that apple should be supporting their phones longer simply because they only have 3 or 4 phone architectures to keep updated, While Google has Thousands. according to OpenSignal in 2013 there were 11,868 distinct android devices available. That is much more than just the iPhone 4s, 5, 5c, 5s, 6, and 6 plus which turns out to only be 6 distinct devices. In my opinion apple better be inventing a flying car, with all the extra time they have. I will say that IOS runs very well on the last couple generations of Iphones. apple has the capability to make their phones very efficient since they control the hardware and software of their phones. For that i applaud them. Iphones are simple, easy to use, power efficient, and look great. However the price tag of all apples devices is not worth what they are selling. They have good product, but their prices are to inflated.
Something that bothers me about the majority of large corporations and their products is the term "Revolutionary" or "The next big thing". When in actuality they are just remaking what someone else has already done. for example the iphone 6 was the first iphone to implement NFC into their design. My S3 had NFC back in 2012. Apple is 3 years behind in current technology. Apple did make smartphones popular but they are no longer revolutionizing anything. They are simply copping what someone else has already created.