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Intel Core i5-7200U advantages
This CPU has higher base frequency than the i5-7Y54 microprocessor.
Support for faster memory with 2133 MHz data rate results in more memory bandwidth, which is quite beneficial to memory bound tasks. Performance improvement in applications, that are not memory-bound, will be much lower than 14%.
Intel Core i5-7Y54 advantages
The CPU is 70% more energy efficient than the Intel i5-7200U processor.
Unless you're a hardcore gamer, the video is more than enough. You've been running XP all this time, so I'm pretty sure you're not a gamer. The 802.11ac WiFi is fine.