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AMD Ryzen offers better price/performance AND longevity as of the CPU choices of today. With an i7-7700K, the CPU alone costs more, has higher TDP (more heat/power consumption), doesn't come with CPU cooler (additional costs), and has lesser cores/threads (which today's, and future, games are starting to optimize - but most especially for editing/multitasking works).
The AMD Ryzen's motherboards, which has an AM4-socket, is also newly-released (just months ago). So, in terms of future upgrades, this platform will have more and better options in the long run compared to the Intel's LGA1151-socket (which is almost 2 years old now). Intel, will release its 8th-gen (Coffee Lake) CPUs that supports that LGA1151 socket in...