I'm a big believer in keeping it cheap and simple, especially on stage. It's usually more robust as well.
I would be nervous about using one as the data source for the other, because if the first one crashes, they're both in trouble.
I've heard that some DJs keep a Monster GoDJ (
https://monstergodj.com/) around just as insurance, so that if they have an equipment catastrophe they can flick it in with a fader and keep the party going while they fix whatever trauma trashed their setup. If you plan to perform with a Force, or a Live, it might not be a bad idea to get one of those as your backup in case you have to reboot your primary.
Sex spreads disease, drugs poison the brain, but rock is still safe.