Bitcoin as a source of income or as an investment plan, which is better?
Why not both? Why not view it both as a source of income AND as an investment plan in order to fully maximize its potential?
BTC can be considered as a source of income especially when you offer your services in payment for BTCs. For example, dozens of campaign signature offer services that pay a person BTC depending on your forum rank. Also, there are some services that require some special work/activity in payment for BTCs.
As an investment opportunity, by basing it also purely on its price history index, you would observe that the potential of BTC to increase its price on the market is significantly high. Given that the next fork would happen this 2024, it is really recommended for people to HODL their coins and sell them at a value AFTER the fork.