I like the simplicity of ITC-308 standard with no plug to affect readings. Yet also like the ability to change-out a faulty sensor so no useful opinion.
ITC-308 Wifi would be great for me. Would save me going down to my shed to make sure the temp alarm is not going off and I could check my phone to see when the strike water in my brew kettle was as the right temp.
I currently only have the standard ITC-308.
(which is still great)