For me its simples a balance between requirements, price, performance.

A better efficency and flowing intercooler is better period and I think we all know the spec r is the best available, but is it worth it considering the cost and your requirements?
Thats the question we all ask ourselves and only you can judge.

For me I have an airtec 70mm cooler because for my stage 3 and a bit it does what I need at a price point that worked for me.
I Can not speak for the others but the Airtec is certainly well put together but it does seem very heavy and weight is the root of all evil for performance cars..

lots of Intercooler choice available good luck choosing.