I want to install 12.10 in a USB 2.0 pen drive. I just want to know which brand will be more reliable? I want to use it for long time purpose. I also want good reading and writing speed from the drive and onto the drive.
I do not believe that this is an issue anymore. To quote wikipedia on this
Just go for a common brand like Verbatim, Corsair, Kingston, Sandisk. They probably get those made in the same factory anyways. All of them will get you at least a few years from the pen drive. Long enough for you to get a new one (with alot more capacity) anyways.
Regarding the second part: speed. There is a very long list of USB drives here but do not expect USB 2.0 to be fast. I myself have a corsair gt, patriot quad channel, jetflash 330. None of these 3 are slow.