If you buy an Apple, you'll pay more than you should. Don't buy a USB 2.0. There are only a few hard drive manufacturers in the world. Apple and LaCie are not among them. Western Digital, Hitachi, Seagate and one or two others make drives. All others (including Apple and LaCie) just put their name on the case. That doesn't mean you shouldn't buy them, just that you're not buying an Apple or LaCie manufactured drive. You're buying an Apple or LaCie packaged drive.
You should look at owner reviews at retail online sites. Only pay attention to verified purchase reviews. Ignore the unverified purchase reviews.
Also, what you most want to know (long term reliability) won't be found in reviews.
I use/have used many different brands including Fantom, G-Technology, LaCie, Seagate, and Western Digital. All drives fail, but of the drives I've used longest, I've never had a Fantom (out of 12 drives) or G-Technology (2 drives) failure. Neither manufacture drives. I know G-Tech uses Hitachi drives, but I have no idea what's inside my many Fantom cases. Haven't used the Seagate long enough to comment. One of 3 Western Digital drives failed, and one of 8 LaCie branded drives failed, but I have no idea what was inside the LaCie case.