I found that other site as well.  (By accidentally typing the name) Seems to be Russian in origin (although I didn't do much digging) and I found their English website to be a little vague on what exactly they do. 

Still, if I understand it, the Russian site has $50 minimum deposit and you can invest for as little as two weeks, which shouldn't be too dangerous if you just wanted to try it out.  It's been operating longer apparently but I'll note that according to their posted profits, you would have made a little bit more profit on The Britis/Panama site if you only had trading shares, and A LOT more profit if you had mining shares. (In fact, you'd have made your investment back if you'd bought in early to mid December)

I'll probably give bitcoin-trade.biz a whirl, see what happens and report back.
As for which one to trust more, when it comes to giving somebody on the internet your bitcoins and hoping to get something back. . .  Not much you can hope for other than hope.