I have a pair of RED wrist guards and I just got Level super pipe pro with biomex. At first glance thet were really disappointment, I just couldn't figure out how they could help but after four days on the hills, I swear they work.The kind of cup the venus mound of hand and provide a kind of step so your hand doesn't strain much in a fall.
Compared with the wrist guards: they both do their job. I try new things every time and try to improve my riding so I fall often and both have protected me from injury and from wrist aches. Biomex allows more freedom of movement though.
I generally buy the best gear I can find and try to make it last forever but if I were you and I knew that I won't be able to use it in two years, I would opt for wrist guards.
PS: don't forget that you can use the biomex thing with other gloves which have a separate inner lining.