Sorry that I can't help you with that other game but if you want an opinion on those X games:
I only played the first two, and although there is no story told in X:Tension, I really must recommend that one over X:BTF. Reason is, X:BTF is a pain the way the game crawls for the first hour of game play, whereas X:T gives your ship a few upgrades for free right away to speed it up quite a bit. Another reason is that in X:T you can fly loads of different ships, not only one. They all have different characteristics, some are slow and sluggish while a couple of them are so fast and agile you will probably laugh the first times you cross a sector in less than 2 seconds real time. Just make sure you're well clear of the traffic lanes
