Meermin Chelsea boots vs RM Williams

[London_UK]

I got my eyes set on this MTO Chelsea boots


I have no experience with Meermin size or quality, but they seem cost effective for a Goodyear welted wholecut boots, plus these boots look good !

I wear RM Williams 9H, do you think I should go for a 9.5 UK Meermin or are their boots comfy enough to keep a 9 UK. I have Carlos Santos and Praboot whole cut Chelsea boots in size 9 and they fit quite good.

It will be very disappointing if their 9.5UK got too much space...