Rafters or uprights?

[Ed21]

Trying to figure out the most cost-effective insulation config for a small loft room. 
Which one do you guys reckon A or B? 


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Edited March 15, 2021 by Ed21

[ProDave]

A for me.  I see the vertical section in B detailed incredably poorly very often.

 

With A you have the potential of warm eaves storage.

[Ed21]

That's what I thought  

Seems a lot better to just do the whole roof, then doesn't matter what happens underneath, 
but wondered if I was missing something. 

Plan A it is then. 

Thanks 

[ProDave]

Is this a new build or loft conversion?

[Ed21]

An existing loft conversion, done a few decades ago.
What Insulation there is not great and not sure what nasties i'll find when I start to remove.
Not looking at doing much with it other than use for storage, so the insulation is more a tidy-up
and a plus for the rest of the house than anything else. .