Another vote for Fireboard. I was a kickstarter backer and have had mine since then. Customer service has been stellar as they had to send me some special updates when I didn't use mine for 6 months while I had the Memphis and the Fireboard got to far out of date to make the jump OTA. They sent me files and walked me through details and followed up to make sure everything was working OK. I love the vast alarm configurability in what to do for alarms, high and low alerts, repeat intervals, etc. I use it on multiple grills and added the drive control for my Weber Summit Charcoal. I love it so much that I have been having to fight hard not to pick up the new sleeker model with built in fan support.
In the end the probably all work and do the job, it's just what is the most polished and do you want WiFi and the ability to configure more.