GE Z-wave dimmers work well, haven’t tried the leviton ones yet.
Echo dot works well as well, but I switched to Google Home (I liked it better, but it’s down to personal preference). Also there’s a few custom integrations from the community for Alexa that takes functionality to a whole new level.
Can’t comment on the Ecobee3 or Sonos. Never used them.
For the bali autoview, before purchase I would suggest comparing prices here as well, you will also find videos on how to add the autoview to SmartThings as well as troubleshooting etc since both are by the same manufacturer, but the Graber one’s are their premium product line: