Lightning SL5 and SL6 are two different models of products. The differences between them are mainly reflected in the following aspects:

1. Processor performance: SL5 uses an earlier processor, while SL6 uses a more advanced processor. This results in SL6 being superior to SL5 in terms of processing speed and performance. This is because with the continuous advancement of technology, the architecture and performance of processors are also constantly improving.

2. Memory capacity: SL6 tends to have larger memory capacity, which makes it better able to handle multitasking and large applications. In comparison, SL5 has a smaller memory capacity and may experience performance bottlenecks when processing complex tasks.

3. Functions and features: SL6 usually has more functions and features, such as higher camera resolution, larger screen size, higher screen refresh rate, etc. The addition of these features makes SL6 more advantageous than SL5 in terms of user experience and functionality.

These differences are mainly caused by the continuous advancement of technology and the continuous upgrading of products. With the development of technology, new generations of products tend to improve in performance, functions and features. Therefore, SL6 has been improved and upgraded in many aspects compared to SL5.