Which drive would you replace first in a NAS?

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My Synology DS1019+ has five drives, three of them are 6Tb and two are 4Tb. I'm going to replace the two 4Tb drives with 10Tb drives over the next few weeks but I wonder which you'd swap out first.

One is a Toshiba HDWQ140 with 28,009 hours power on time.
The other is a WDC WD40EFRX-68N32N0 with 28,064 hours power on time.

Both are showing healthy and both have similar run times. That's a little over three years.

Which would you pull first?

I've got two volumes and I don't think this initial upgrade will give me much more than a couple of Tb extra space so hopefully I can increase each volume by 1Tb.
 
I wasn't specifically looking at the one with the lowest run time, it's which drive I'd rather have still running, the Tosh or the WD.
 
All done. I pulled the WD and slapped the new one in. It took around 26 hours to rebuild and then just a few seconds to resize the two volumes.

I'll give it a while and do the other one.
 
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