For bitcoin particularly I use TA sometimes, because the coin is old enough and has enough volume to do that but for ANYthing else, I would rather use FA , because most of them are new and in cryptocurrency,
I dont think we should divide the altcoins like that. Both FA and TA are important but what I have felt to be most important is that if you are going for a long term hold and sell your entry and exit points are, thus FA is what is needed. If you are day trading you need a lot more of TA and it is risky.
some times a coin moves 100% up or 100% down with which TA techniques you wanna explain that?!
There are inorganic pumps done by groups of cryptocurrency shills in a coordinated manner. You cannot explain or predict when this is going to happen unless you are one of them. The point is that doing TA on such a coin you will make a wrong prediction.
Rather if you hold such a coin already, dump it when this happens.