I want to buy a pre-paid game time card for my friend, we are both from the Philippines. The cards seem to be region locked, do I get the EU or US and OCEANIA one?
You are on a US/Oceania server, so best to get one for the same region.
Seeing how you have a level 20 on the US/OC side, I’d say US.
As others have pointed out, to get game time for the character you’re posting on you want the US/Oceana card.
If you’re asking which region you should be playing in, that’s a little more complex. One thing to consider is what time of day you’ll be playing - will you be following a schedule that’s closer to a typical day in the US, the Philippines, or the EU? Pick the region where other people are likely to be playing at the same time as you if you want better access to group activities; do the opposite if you want fewer people around.
Language is another thing to consider - you want to be able to communicate with other players. I haven’t played on EU servers but I assume there’s more variety of languages there, which has it’s pros & cons. The US servers are pretty much all English except for the ones set aside for Latin/South America. No idea what Oceana is like.
The Oceana servers are located in Australia, I believe, so they are physically closer to you than the other regions; that’s likely to be of some benefit in reducing lag.
Whichever region you pick, you should try it out playing for free to see what it’s like before buying game time.