I am going to plump for Hybrid Winter Barley, DD’d if you want to, every time.
There is absolutely no doubt IMO, that it has an incredible suppression ability against Blackgrass.
I use it as one of my major BG strategy tools. Especially in a 2nd white straw crop situation. Where BG is really bad, even as a 1st (and 2nd).
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I am wondering about continuous spring barley with a cover crop planted between each barley crop to vary whats growing in the soil. Is there a hybrid spring barley? and what variety are you growing winter wise?