to be honest, i can't really tell the difference in the 6 that i had and the 8 that i have now. both have been the best phones I've had.
the only other phone i had that was this good (for it's time, 2010) was the Samsung Captivate, also known as Galaxy S1. Samsung was ahead of their time. it made me stick with Samsung for the next few. it was my first android phone.