good question but it's clear that the platform that aapl has is more capable of monetizing the business. AAPL is up because of the fact if people are willing to spend for RIMM that AAPL is benefiting as well to the upside.
Let's not be too harsh here... I mean there is a slight possiblity that RIM is beating iPhone in business market. If that were true AND AAPL had so-so iPhone numbers when they report then all combined that could be a bad thing for the stock price.
However... that being said... I do NOT think that AAPL is going down. RIM results are gonna help AAPL because people were worried about phone market in general. So RIM is UP we expect AAPL to be even better (now one could argue THAT is a problem for AAPL by setting up too high of expectations... but AAPL always seems to have that problem)