Fun factor, personal preference, availability, options...I can think of plenty of reasons.
Russell bought a mid 90s BMW, so I assume had he been interested in a Lexus, he would have bought a mid 90s one. In my opinion, mid 90s Lexuses are pretty boring. Style wise they are just plain, and they are not as performance oriented as a BMW. Besides, maybe he just likes the BMW more. There isn't anything wrong with that.
Russell bought a mid 90s BMW, so I assume had he been interested in a Lexus, he would have bought a mid 90s one. In my opinion, mid 90s Lexuses are pretty boring. Style wise they are just plain, and they are not as performance oriented as a BMW. Besides, maybe he just likes the BMW more. There isn't anything wrong with that.