hi richard,
the only thing that i've read is that sony tapes are different (either wet or dry) and the other brands are the opposite. so if you pick sony, stick with sony. hopefully someone can give you the specifics on why sony tapes are different.
most places like sam's, cosco etc sell them in a pack of 6 or 8 and then seem to keep the same brand in stock all the time, so more then likely, if you buy locally, you will be able to get the same brand. and if you buy online, you will get the same brand.
i picked maxell, because i shop at sams and that's what they have - LOL i'm on my second pack of 8 tapes and haven't had any problems.
i hope this helps.
indera