It will be hard to get results that reflect the real portion of failures. Unbiased polls are hard to do.
What you expect is that the most popular drive among the people that read this topic wlll have the most failures reported.
I remember when Seagate had the most popular HDs around. That was when HDs normally had 20-30 Megabytes (not Giga) in PCs, and Seagate probably had over 80% of the market. (They were the only ones to make HDs so cheap.) Tech after tech would say they saw far more Seagate failures than anything else, so be forewarned. But you would expect them to see Seagate failures at a rate 4 to 1 if Seagate if the rates were equal to other drives and they sold 4 times as many.
Those IBM 75GXP drives had a great following among performance freaks. A portion of these guys liked to use IBM drives in extremely heavy duty situations, where expensive SCSI drives would more normally be selected. So hpw much higher would the reported failure rate be if the rate was actually the same as for other consumer drives?
There was a local TV station that used to do phone-in polls. You phoned one number or the other to vote yes or no. On very hot topics they would report that the phones were constantly jammed, so keep on calling. The vote count was alway split 50-50 to within a fraction of a per cent in this case. How strange! Of course the split just reflected the fact that to vote on either number took equal time, nothing else.
I've had problems with 2 hard drives. A 700 Meg Western Digital that would fail to spin up if I left the computer off for 2 days in a row (stic-tion). You could get it going by taking out of the case an putting it back. And a 45 Meg RLL Mitsubishi, when I took it out of my "junk" pile of antiques a few years ago to see if it would work. A lot of bad sectors, and sectors-not-found. I am not sure whether to call either a failure. I have had failures-to-boot many, many times, but except for that one WD, a retry always works. I have never lost a single bit due to a hard drive "issue". I expect that to change with HDs now in the $50 range.