Best way of reducing rad. Valve to 10mm

[Matt0029]

Which is the best way of reducing a rad. Valve down from 15mm to 10mm. A soldered reducer or an internal reducer?

 

[Matt0029]

Don’t worry about the flow, the big restriction is in the valve.
Any of the above methods are fine, it’s just about the aesthetics- which to be honest will be overlooked within a few days !!

Thank you