For a start, the TG167 is only 80x60 as it uses the second gen Lepton core. You'll also have less features and won't be able to use third party applications that could be useful to you.
The TG167's purpose is essentially for those who will chuck it in a toolbox and only use it for quickly checking plumbing, fuses, heating systems etc. There isn't any faffing about with having to connect it to your phone, run the app etc...