best way to incorprate free trial version? ( lite version vs in app purchases)

[1last try games]

Hi ,

I am currently almost finished on my first app puzzle game called Evil Square ,
and was wondering what's the best way to go about it.


should I have a full paid version and a lite version with just a part of the full game ?

Or release the game for free and have an in app purchase to get all levels?

Thanks!

any help/advice would be great!