Hi Stinkey,
Welcome to the forum. To start with, please read the forum rules. We use our real names here and the rules will explain an easy way to insert it into your signature.
Regarding the machines, recording and playback quality depends a great deal on the square inches (so to speak) of tape that is imprinted with the signal.
Tape width/format and tape speed determine how much tape is imprinted per unit of time. To find a common denominator between the 1/2" 8 track and 1/4" 1/2 track (two track) well can see that if they were both 1/4 inch than the 1/2" machine breaks down to 4 tracks. That's twice the number of tracks than the Bll 2 on the same width of tape.
So, if you don't need those extra 6 tracks, you'll get better sound and much lower tape costs with the Bll 2.
Take a look at the price of tape here;
http://usrecordingmedia-store.stores.yahoo.net/If you do need the 8 tracks and you wish to mix down to tape, you'll need both machines.
If this is a budding project studio that you're planning, you may want to start out digitally and find out what you
need rather than letting the hardware dictate what you can do (although that sounds an awful lot like the way I've done a lot of things).
For general information about the bits and pieces that fit together to make magnetic recordings, check out the "Beginners Guide" and "Reel to Reel Links" located in stickies above the General Forum.