Many guitar players don’t understand the difference between 6:8 and 3:4, but this lesson will clarify things for you. 
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It says in the lesson:
The confusion comes from the fact that 6:8 and 3:4 both have six pulses. But here’s the difference: > 6:8 has two beats, each divided into three, while 3:4 has three beats, each divided into two.
This makes me wonder what dictates 6:8 to have the eight-notes split in groups of three (resulting in two strong beats pr measure) and 3:4 to have the eight notes split in groups of two (resulting in three strong beats pr measure)? Is anything in the time signature indicating this?