It says that the 89259 has a stranded center conductor, which would make it more flexible. Probably explains the price difference, too.
It might be an option for you if your cables have to exist in a confined area, and you need them to be more bendy. Otherwise, stick with the 1505F.
Martin
Edit: OK nevermind, they both have a stranded center conductor. The 1505F has a double braid, which would go towards better EMF/RFI rejection. The only other notable difference is that the 89259 has flourinated ethylene propylene insulation and jacketing, as opposed to the 1505F's plain 'ol ethylene propylene. I have no idea what that's about, but it probably has something to do with the price.