Yes, from what Experts have said so far, PoW is very hard or almost impossible to compromise instead of PoS, where more attack vectors can be found.
To compromise Proof-of-Work, you need to find a way to do the work easier than the rest. That would require to either find a solution to the
P vs. NP problem, or detect some sort of exploit to the SHA256 function.
Altcoin developers are not focussing on security.
Altcoin developers focus on their pockets.
Bitcoin is better like Electrum for example. It's design is not so nice but Electrum is good tech and recommended by many experts.
Note that Electrum has had experienced technical vulnerability as well:
https://bitcointalk.org/index.php?topic=5090097.0. But, that's normal, it's the way progress is made in software.