@James ******
hi James, we just came back from Singapore with our visas got from Thai Embassy.
Big pros (it also a con if you donโt have time) to apply there is that you should apply online first (they ask in 10 working days before your planning return trip to Thailand) with all documents attached and they will guide you if all docs are ok or not sufficient BEFORE your trip to Sg. Register account and apply here
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List of documents here
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If any questions after/during applying- send email with your full name, citizenship and passport number here
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The Embassy work from Mon to Thur (Fri is day off always), off days in Thai and Sg public holidays
When you got pre approval for all your documents you should come and apply IN PERSON (website has controversial info, but in reality they require in person only) 9-11am , and get your passport with visa back two working days later 2-3pm (pick up could be done by anyone who provides a pink ticket got upon passport submition ) so if passport was submitted on Monday, you got it back on Wed, Tues - on Thursday, but Wed/Thur - next Mon only.