There is something wrong with your opinion, bitcoin prices are not caused by technical analysis and fundamental analysis, but technical analysis and fundamental analysis is a way to predict future bitcoin prices, the first knowledge you should know.

So, may I change your question to be 'technical analysis or fundamental analysis to find out bitcoin price?'

In the world of investment and trading we really need to know both analysis. Although only an accurate prediction can not be sure, but here's our basic step to buy and sell an investment or trading. In general a trader may use technical analysis to buy and sell, because they believe in the word 'history tends to repeat itself' because technical analysis tends to be used for short term. While fundamental analysis is more often in use by investors because it uses a long term approach. We know information coming to cryptocurrency, such as regulation from a country or company that will ban or accept their bitcoin first review after a few weeks or months they will announce their decision.

And investing in this cryptocurrency me myself is not focusing on trading and investment as both are very profitable, unfortunately to be abandoned. My suggestion is, if you want to spend money to plunge into the world of cryptocurrency, it would be better if you know both analysis. Technical analysis and fundamental analysis are very important to learn, don't choose one between two (because only two choices, not much)  because you will dump afterwards.