if you can't land a trick in straps but you can in boots, they make a difference

a good point to make is that, boots are great for doing freestyle tricks because you've got a really direct connection to the board, your feet won't come out (unless you try REALLY hard to catch a solid edge) and you'll find you can land with a lot more power and speed.
Having said that, crashes hurt more and put a whole lot more stress on your body, you're locked in to that one position where as foot straps you can move around a little while riding.
but straps have their place. learning a new trick can be good to start with in straps because you won't catch repetitive heel edges and end up concussed, if you're kiting in heaps of chop or waves and just having a play around, not too worried about being 'legit', than the straps are heaps better as they allow you some freedom of movement in your feet.
Mix it up, try them out, beg borrow or steal them from a mate and see what you think