Actually, both methods are still good and good ways to increase the amount of our bitcoin accumulation to achieve the expected profit, the only difference is in terms of how to execute it, buying when it goes down and waiting until the highest ATH is quite tempting but the problem is you need to learn more to know that it is the most appropriate price to buy and also you need a large enough capital to get maximum profit when one day the price reaches the highest ATH. While with the DCA method you don't need to think about those things, the point and key is to be consistent in increasing accumulation and you are also free to determine the time to increase your accumulation, if I prefer every 2 weeks with more or less the same amount, DCA really makes it easier for us small investors with limited insight and knowledge about the market. 
All strategies are effective for investing in long-term plans. I will not call any strategy bad, even there is no room to say that. Any strategy for investing helps in growing your portfolio. But depending on how effective it is, it is advisable to practice the strategies. Suppose there are 3 students in a class, one of them attends classes regularly, the second attends classes irregularly, and the third only attends exams. From here, which type of student would you prefer to be? It is worth noting that the exam results of all three students are almost the same.I think that most people would prefer to be a student who attends classes regularly. There are some reasons for this, such as, you will have more knowledge than the other two students, you will be ahead of them in achieving your life goals, your chances of surviving in student life will increase. Even by being regular in class, you will be proficient in classwork.
Still, some people will prefer an irregular student life like the second and third students. The reason for this is the result, they will think that since the test results of all 3 students are the same, then why should I be consistent in class only? But they are forgetting that they are getting good results in only one class. But they are not getting any knowledge, they may have to delay in fulfilling their life goals or their chances of surviving in student life will decrease. Even your chances of being inefficient in student life will increase.
Now if you compare student life with investment, you will find some similarities. The investment strategies can be likened to the three students. DCA strategy is like the first student who is consistent in class. Lump Sum investment is like the second student and DIP strategy is like the third student. DCA is a consistent investment strategy, Lump Sum is as you wish, you buy when you have money. Dip strategy has no specific time, you enter the market only when the market falls. The result is that you may understand from the example of the students and you can already realize the benefits of the strategies. So you need to determine what kind of investor you will be and also keep in mind what kind of results you are going to get from it.