Better way to own Bitcoin with ETF’s or actual Bitcoin Casper?

I own a good amount with etf’s but feel like due to bitcoin being on paper it’s susceptible to demateilazation the same way that stockd are nowadays. so which way is better? with etf’s do you actually own the underlying asset? if the paper etf’s cease to exist or a major crash happens will they be valueless? or do crypto etf’s have something that make it easier to get my money or bitcoin out? just trying to understand which is the better long term. thanks gents.