What are your needs? Do you require something that will withstand constant exposure to a harsh environment? Do you need something that's versatile and will decode across all bands with multiple protocols?
If you're looking to only monitor the CVRCS, both are equally good choices, it just depends on your needs.
If you want to also Monitor STARS, surrounding jurisdictions, etc., the SDS may be a better choice.
It all depends on what you need/want. Both will perform equally on the CVRCS.