The new Samsung Galaxy S7 comes in with the latest Snapdragon 820 processor with a 4GB RAM. The Apple iPhone 6s, on the other hand, will come with the A9 processor from Apple with a 2GB RAM.
In general, it is believed that the Apple iPhone 6s should be slower than the Samsung Galaxy S7 since it comes with a smaller RAM and all but that is not the case as those that have tested out both these devices stated that both smartphones have similar speed. In fact, some even pointed out that the Apple iPhone 6s is a little bit faster than the Samsung Galaxy S7.
Well, it does not surprise us because the problem here was never about the specs but how these smartphones were made. Because everything in the Apple iPhone 6s belongs to Apple, they can make sure that everything is optimized for the device.
In the case of the Samsung Galaxy S7. Samsung has to work to match it with the Snapdragon processor and Android so things might not run as smooth compared to the Apple iPhone 6s.