It baffles me that some people will pose arguments when they clearly have no idea what they are even talking about or have a grasp of the thermal dynamics of it at all. Let's start with the facts so we can weed out all this nonsense.

1. The 350 is much more restrictive than the GTZ.
2. You will never achieve identical flow rates in any system with these 2 blocks with the same pumping power.
3 Comparing Swiftech to Koolance in terms of testing and data is just trolling and in fact proves general ignorance.
4. If the 350 and the GTZ were both tested at the same flowrate (1GPM for example) it is likely that the 350 would perform better.
5. #4 is a flawed argument even though it may be true. This is because for the 350 and the GTZ to have the same flow rate you would need significantly more pumping power for the 350. This would negate the higher flow rate.