My experience with HDDs is that since 1994 i NEVER had a issue with a HDD failure...and yes, one of them was deactivated only this year and was running since 1994.
OTOH, i heard a LOT of horror stories about SSDs.
SSDs won't catch up with HDDs any time soon....as SSDs increase in capacity, so will HDDs.
Let's not even talk about price per GB....
Notice that as SSDs density increases , lot's of problems with data retention are creeping in....a lot more problems than with HDDs.
However, i also like SSDs....for example to run OS and apps from it , a nice 120GB SSD/mSATA is ideal....complement that with a nice high capacity HDD for storage and you get it right....