I am not sure VO is selected based on Nationality or country of residence. If anyone have any info on that ?
They do select LVO based on the nationality. However, Ottawa VO will take some applications for unknown reasons. My guess is that Ottawa takes some applicants that already have super visas. Even then, they do not take "all" of them.
In any case, the decision lies with CIC, not with the applicants. You cannot choose which LVO processes your files. Otherwise, there will be hundreds of people asking for Ottawa or whichever LVO that seems to process fast. Then, Ottawa VO will be the slower VO due to the amount of applications it handles. Then, other slower LVO such as London VO will be the faster one. All of a sudden, quite a few applicants from Ottawa will want their files to be sent over to London. It will be a never ending cycle of jumping the line. For that reason, CIC makes decision on the LVO that processes your file.
You are certainly welcome to try and ask CIC to send your files to Ottawa VO. Let us know if that works.