The VDB770 does not work with any SVR. There is no 24/7 recording option for the VDB770 at this time.
Descriptions and data sheets for comparison of the two SVRs are found in the links below:
The CSVR2016 has built in POE switch for POE models of Alarm.com cameras.
Other differences beyond what you have mentioned are the total storage capacity, the CSVR2016 has twice the potential capacity. It has an additional display output. The CSVR2016 records up to 4mp if available on the camera model. The CSVR126 supports 1080P.