Which is better; DSC Power or Honeywell Vista?

Currently, you can’t… however, the L5100/L5200/L7000 support the L5100-WIFI module OR the ILP5 Ethernet module (one or the other - not both at the same time)… which provides a web interface for monitoring and control using the L5100 connect app for IOS and Android. The modules (are supposed to) support an HTTP API, so a Vera interface is possible (but does not yet exist).