Verbatim MCC disks are made using the same process developed by Mitsubishi, no matter which country/factory they are made in. There were some reports that the Verbatim disks made in India were of lesser quality, but that seems to be corrected these days, and many of our users and mods now like these Indian made disks quite well.
It is possible to find Verbatim in Europe that comes with Taiyo Yuden mid codes instead of the MCC codes. Those are not as well liked as the MCC code Verbatim.
You won't find any single layer MCC media from Singapore these days...unless you live in Singapore...there may be some still there. The double layer dvds sold under the Verbatim brand are made there and in India, and there are some reports of them being produced in Taiwan now. These +R DL have either MKM001 or MKM003 mid codes. Singapore made DL Verbatim still have a better rep than the Indian ones, and the Taiwanese DL seem problematic so far.
So, for 16x Verb single layer, don't worry about country of manufacture too much unless you are in Europe and don't want the TY version.
For DL Verbatim, I'd still want the Singapore made disks, though the ones from India are probably ok. I'd avoid the Taiwanese made DL Verbatim.