As some of you may or may not know, I'm just a home garage miner, so I'm looking for some input from the pros. 
I was running five S17+73's for a while, but as they age, problems pop up.  Temp sensor is usually the culprit. 

So one of the units dropped a board and I just sold it running 2/3's as is to a guy for $3300 a few months ago. Felt that was fine. It was more than I paid for it.

Then another one dropped a board. Same issue.  Sent it out for repair and was told it had too many bad chips for them to repair. Got it back today and it sound like a box of marbles. Obviously most, or all of the heat sinks came loose during shipping.
 
So now I have one brick, and three running units.

I'm considering selling everything I currently have, before they also die due to age.

I did some math, and running two S19pro 100's would be more profitable than my current three S17s.

Money wise... I think I can sell my current set up for close to what I would pay for new S19's. The difference would be recoup'd in a month or two.

So my main question to the folks that know....please tell me the S19s have better heat sink engineering.  I'd like something to last more than a year before it gives me issues.