I'm not well versed in studio photography, but I'm not sure I would go for either of those options to start with. Unless the plants are very big or can't be moved the easiest solution would be a light tent and it would also probably produce better and more professional looking results as it can give an extremely soft, yet flexible light and that is exactly what you want to start out with, IMO. You could buy one, but why not try to build one yourself and see what you think? You can find directions here:
http://strobist.blogspot.se/20...
If you haven't done so already I'd highly recommend you to also read this:
http://strobist.blogspot.se/20... as although it's not directly about plant photography, it will give you the basics of light and a good foundation to stand on. In the end it comes down to what quality of light you are after... we all have different tastes and different looks require different methods
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