a skate banana is awesome they dont get much better in my opinion. and are great for an all round board. it really depends how much more time you want to invest in the park. the lib tech box scratcher is a wicked little jib board for the park. but out the two boards you have listed i personally would pick the GNU riders choice board. every review i have seen on it is at least 4 out of 5 stars everyone loves it. and my friend in st anton swears by it he wont even look at another board for fear of the GNU leaving him lol.