Should I use same Apple ID on both my iMac and iPhone

Hello,

I have an Apple ID that i use on my iMac and I have another Apple ID on my companies iPhone.

I'm leaving the company so have bought an iPhone for personal use.

Is it better to use a different Apple ID on each device and use Family Sharing or should I be looking to use the Apple ID from my iMac on my new iPhone as well?

Thanks!