what is the difference between dik points and chick points? i mean what is the gameplay difference? and which path is better?
Yes! That one is better.
Seriously, either do your own thing, do multiple routes, or use a mod. Different people will give you different opinions on which path is best. But, in my opinion, there is no best path. No one path will give you everything, in hot-scene terms.
The main difference between DIK and CHICK points is purely in conversations. More attention is given to actual choices (variables are kept for a lot of them) and especially to Major Choices.
There are 3 Affinities that can be reached by your choices: DIK, CHICK, and NEUTRAL, and these can affect what happens with the ladies.
There are also 5 principal LI's for you to choose from, plus tons of side girls. And by the end of Episode 8, you WILL need to make a choice.
Of course, the Interlude has thrown another wrench into the machine, and your choices might be affected as the game moves into Episode 9.
Have fun. Most of us here do.