There are few cool speed test tools available out there which allows you to test network latencies and speed to data centers from different countries and locations. Along with finding the closest Datacenter near your location, it tests the storage latency as well as upload and download speeds.
Check it out from the following urls:
𝗔𝘇𝘂𝗿𝗲: http://azurespeedtest.azurewebsites.net
𝗔𝗪𝗦: https://cloudharmony.com/speedtest-for-aws
Make use of the above tools to identify which region is suitable for your solution. Hope it helps.