Whether investing in miner or investing in hash rate services, both of them are a viable way to invest in blockchains, which are superior and inferior and vary from person to person.
If simply calculate the price, some mining machines may be cheaper, but lots of hidden costs will occur.
Overall, purchasing miner is suited for the users who have professional skills, sufficient time and labor, mining farm with cheaper power cost. But the hash rate service if for everyone, easy to start and real-time tracing. What the users need to do is to wait for the earnings transferred by the pool.