Is buying regular bitcoin a mistake vs. Bitcoin Cash?

I've been following this sub for a while so I'm aware of the split, and how this is the OG bitcoin (can't remember why cash is better however). I recently bought $50 of Bitcoin through cash app because of how simple they make it (first time crypto buyer).

My intent is to hold long-term and continue buying more because it's better to have money in assets instead of putting it all into savings.

My two questions are, is buying bitcoin a mistake because its not bitcoin cash? And is there an easy way to buy bitcoin cash?