Rachel or Lisa?
 

Rachel and Lisa often nominated each other during BB9, and had a bit of an unspoken rivalry going on. I don't think Rachel understood Lisa, and Rachel got on Lisa's nerves if my memory serves correct. I liked Rachel, but she was a bit unintentionally ignorant towards others sometimes - for example, she didn't realise that Darnell was albino until towards the end of the series.

Did you prefer Rachel or Lisa?

Have to say I preferred Lisa, even though she was/is a bit fame hungry. She came out of her shell after Mario left too.

This is just from what I remember when it originally aired, so I might re-watch the series to see if my opinion changes.