Actually, this year bitcoin has performed better overall than almost all alts.
Of course, everything is down compared to last Jan. but btc has stabalized and its market share has actually grown this year.

What this means is that when the market crashes and there is a prolonged bearish sentiment, people go to something they can trust.
This has made it so that btc has never dropped to the 5000 usd price range.

When you look at things short term, it may seem like alts perform better.
When there is a pump some alts jump as high as 15 to 20%.
But its important to look at how far it crashes after a correction.
Those alts that pump well almost all fall right back to where they were or even more.
In a way, it is totally depressing lol.