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They are really for two different kinds of situation. For hard driving on sustained boost an air/air would be better, for normal more varied driving a water/air would be better. The water has a MUCH higher conductivity and thermal capacity so it absorbs the peak temperatures much better, the only problem then is that you are then on to the next limiting factor which is the volume of water and how effectively you can cool that. Also there is the additional weight to factor in for the air/water system but it also has the benefits of generally having shorter pipework required so slightly better response.
At the end of the day all installations like ours are bespoke, as are the builder's requirements...
Wally has obviously got his to work well with short pipework so is definitely on to a winning solution!
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