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I tried both ways. It's more like a lottery for me. Sure there are charts you can follow and I have seen real results. Most of the traffic comes from US. For instance after 18:00 UTC there are more people online. If you post something at 3 AM it's less likely to be seen.
I also had some good post just posting at random time. Considering that Steemit is getting bigger, time differences will be less noticeable​.
It's always a good idea to plan before you post.

I want to post via streemian during the follwing days. As I can choose the time there. I will experiment.

Generally aim for 17:00-22:00 UTC

thanks. I will do that!