How much is the suggested amount of starting investment on bitcoins? In United States Dollar currency please or Philippine Peso.
That will depends on what can you afford for.
If you using Bitcoin in a trading way you need a good capital on it something like 150$ is a good start in trading.
and also, is it better to invest in bitcoin rather than investing in stocks?
For me is better to invest in Bitcoin because your money is on your hands unlike stocks your money is in the company.