Hi meowth08,
When I first saw your question, I was not sure what the question was. I may be wrong, but here goes.
It seems you are asking two general questions:
1) Should you have sharp right angles or use curves; and
2) Whether you should use a copper pour for GND, Vcc, or nothing (i.e., the pour is not connected to any signal???).
For the first question, you may find some help here on about page 11:
https://www.electro-tech-online.com/custompdfs/2013/03/PCBDesignTutorialRevA.pdf
It is really just a matter of taste; although, that author (David Jones) suggests that sharp corners may lead to some manufacturing difficulties. Many people also prefer the look of 45° angles instead of 90°. From an electronic standpoint, no difference between rounded, square, or 45° angles can be demonstrated below about 1 GHz.
For the second question, I think you will find pours used more frequently than open boards with no pours. For one thing, it reduces the amount of copper waste. There are also electronic reasons to have signal pours for noise (e.g, a ground pour) or current carrying capacity. If weight were a big issue, you might opt to do without a pour.
Given that, and assuming weight is not a controlling factor, I would go with A-E or B-F. Of the two, I would go with the ground pour. In my mind, a short to a ground pour would be less likely to create a problem than one to a Vcc pour. On a power supply I built a few years ago, I had both ground and V+ pours.
John