You've read the title of this article and I know what you're thinking. You think I'm a shill, because only shills would say "sell your X coin for Y coin" and actually that's fair. I'll admit that I certainly sound like a shill, and denying it would just make you more certain I was. I will promise you one thing you can trust in absolutely though: this article will be short.
So, why should you sell your Bitcoin for Bitcoin Cash?
You can actually use it.
Yup, that's it; that's the article. Consider the fees and transaction throughput limit for BTC and you'll have to at the very least question its ability scale to allow the whole world to use it, let alone li'l ol' you. Meanwhile, BCH is usable as cash in day-to-day commerce right now.
If you want more than the TL;DR version, I'll give you three quick points you can easily apply to your own experience HODLing Bitcoin (BTC):
Bitcoin Cash is only called a "scam" by the most vocal, die-hard Bitcoin (BTC) maximalists. Most people see Bitcoin Cash (BCH) more neutrally, as a fork of the original project that's trying to scale in a different way. The next time you see someone call Bitcoin Cash a scam, check their posting history. You may be surprised by who you're allowing to influence you.
Both BTC and BCH fans think the days of fiat's dominance are numbered, but what happens when you actually need to buy necessities without it? When was the last time you actually bought something with BTC? If you used Lightning Network, how was the user experience? Was the BTC you spent actually your own (did you own the private keys?), or did you use a 3rd party's custodial wallet? What did you pay as a fee? Did the size of the fee make you think twice about making the purchase considering the value of the thing(s) you were buying?
Bitcoin Cash is not only accepted online, but also by thousands of brick and mortar businesses around the world and growing, with fees of less than a single USD cent per transaction of any amount. Just tap and go, right from a wallet you own to the merchant. It's simply the way Bitcoin was meant to work in the first place.
Transaction volume on the Bitcoin Cash blockchain is now exceeding that of Bitcoin, and fees are still below one cent. The world may not yet know that Bitcoin Cash works the same way Bitcoin does, while handling more transactions for bargain basement fees, but someday it will. Sure there are other blockchains out there that could be stiff competition for Bitcoin, but no other chain is practically a 1:1 swap out for Bitcoin than Bitcoin Cash. Will it happen? Who knows? But if it does, will you be ready?