Non-equalising TRSCSSVs are by far the most common choice for oil and gas wells in Norway. It is driven by simplicity and reliability as Lars says, - and it has worked out well. So history become a factor as well... Obviously you need some method of equalising the DHSV, - if this is difficult then you can be driven towards self equalising valves.
The Exprosoft WellMaster database is excellent for DHSV reliability, but unfortunately it does not resolve NE versus E DHSV properly. Personally, I am very much in favour of simplicity when it comes to such a critical component, in true Skunkworks spirit. KIS is your friend... Quite a few years back there was a case here in Norway where the equalising mechanism failed catastrophically, - with full communication through the closed valve.
There is one mature NCS subsea development with close to 30 wells that use equalising DHSVs. On one well the equalising mechanism does not work, one 3 wells the equalising is super slow (feature plugged or scaling up), and on the rest (about 25 wells) it works as intended.
Finally you should also be aware of the hydrate risk for this issue. The DHSV is probably the place in the well where you are most at risk for hydrates, unless placing it deep below the hydrate region. When the valve is equalised, glycol is used (MEG), thereby mitigating the hydrate risk. For a self-equalising DHSV, you have JT cooling through the equalising valve, and the hydrate risk increases and needs to be mitigated.
Anyway, - good luck with your selection!
Lasse Hermansson, SCE