Suztera :
If you get an i5 6600k, you should ideally get a Z170 motherboard.
To answer your question, the GA-H170-HD3P is technically better as it has USB3.1 whilst the HD3 doesn't. If that doesn't matter, either is fine.
Hi , someone told me the same, that if im taking the 6600k i should get a z170 motherboard but im not going to overclock it and i compared them and i saw that the 6600k is better, this is the main reason im taking the "K" one instead of the regular 6600
do I still have to take a z170 even tough i am not going to overclock it or can i take the h170 motherboard?