Which Dry Verge / Dry Ridge system to use?

[aa44]

I am about to build a new house (for me). The site is very exposed (Shetland) and I want to use a Dry Verge and Dry Ridge system to help keep the slates on. The slates will be 7-9mm heavies on a 45 degree roof pitch, (battens on top of sarking board)

Can anybody give me advice on which Dry Verge / Dry Ridge system to pick?

Thanks for your help.
AA

 

[noseall]

Marley, Klober?

 

[aa44]

Both on my list. I was just wondering whether people found a particular brand easier to fit / better at keeping the weather out / stayed on the roof longer, that sort of thing.