Most of the hearsay on drive brands comes from the reports put out by Backblaze every few months.
https://www.backblaze.com/blog/hard-drive-stats-for-2017/
Unfortunately people read those reports wrong. They try to oversimplify by reducing it down to "which brand is more reliable?" The way you need to interpret those reports is "which model is more reliable?" Every drive model uses different and new technologies. Sometimes it works and you get a reliable model. Sometimes it doesn't and you get an unreliable model. All brands produce good models, all brands produce bad models.
In their latest report, two of the Seagate models are stinkers (actually only one is, the other hasn't been in use long enough to tell if the single failure was a fluke or indicative of bad things to come). If you subtract those two models, the remaining Seagate models are actually more reliable than most of the WD models. So there's very little correlation between brand and reliability, whereas there's a high correlation between model and reliability. Backblaze seems to have caught on to how their reports were being misused and stopped generating a chart which summarized reliability based on brand.
I've been steering people away from the 5400 RPM WD drives because of problems with an extremely short head parking timer. But as you're looking for a 7200 RPM drive, this is not an issue. I'd say look at the Backblaze report and make sure to avoid drive models they've found extremely unreliable. But otherwise, buy whatever brand you like or has the lowest price.
And most importantly, assume your drive will fail and be sure to keep good backups. An external backup drive for quick and easy access. A cloud backup in case your house burns down along with your backup drive.