Replacement hard drive question for plex

born2ride

Getting the hang of it
Mar 9, 2014
380
10
New Jersey
Was hoping you guys could shed some light on my choices. Its not Blue Iris related figured hard drive advice would be ok .
My 10 year old smaller 4tb drives are starting to fail. I was looking at the 10-14 tb WD red 7200 rpm with 128mb cache. My question is how will a larger single drive handle 2-3 plex streams then my 3 smaller ones. I am not even sure if it would matter. Looking for suggestion and input!
I read the 128 vs 256mb cache articles and they state is a slight increase for multi stream use, is it worth the extra money? TIA