Wanted to ask which one is better for watercooling, the D5 Vario or DDC3.2?

I notice D5 Vario head, pressure and flow rate is higher than DDC3.2.

However I found on Martinm210's Excel Flow Rate Estimator that as soon as the D5 Vario has a little restriction, flow goes down, and DDC3.2 is slighty better flow.

I want to buy a couple of these pumps, and I'll be using the EK tops on them.

I've tried to search the forum a little, however I'm told the D5 Vario is better, but Martinm210s chart says otherwise.

Thanks guys.