In my opinion it really is about how you want it to look and how much work you want to put into it. If the frame will allow for you to secure independent strips (such as on a deck) then that would certainly be the easiest way to go. Plus, if it will be in the rain, then that would allow water to drain through the gaps more quickly. On the other hand, if you prefer a solid top, then you could go with tongue and groove or just a simple butt joint glued with waterproof glue. It would certainly be attractive and probably easier to refinish since you would have mainly two large flat surfaces rather that lots of edges on the strips.
I know I didn't help any, but in the end it just comes down to what makes you happiest.
I know I didn't help any, but in the end it just comes down to what makes you happiest.
