I'd theoretically prefer Hubitat since it's more powerful than Lutron's automation capabilities (or that of most other systems with which it can integrate: Philips Hue, etc.). However, there are certain cases where Lutron-to-Lutron via Hubitat automations may cause a 1-second delay with the Lutron commands, which you can read more about here:
In that case, you may wish to use all Lutron if it meets your needs. You may not always notice or care about this issue (e.g., if your lights have a slow fade-up time), but it can be good to consider.