Overhang versus parapet roof on glass box extension

Would appreciate your advice on the better option on a residential extension in Ireland. South east facing back garden that is very short.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.